Malicious PDF — malware analysis report

Static analysis result for SHA-256 550fd6dcce0b73fb…

MALICIOUS

PDF

45.8 KB Created: 2020-08-30 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7c7a3a4d08fd3ba51e661802a2cd27de SHA-1: ef321673b9fb175ecf5c91068b69b77ac274d518 SHA-256: 550fd6dcce0b73fbf6fa9de9c22db3840d1d74b2b687bcf51fcdea1343e0ada9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/wix?keyword=peliculas+sin+megavideos', which is also flagged as malicious. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, potentially for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=peliculas+sin+megavideos In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc03df_a8256b46d1164f1790419aa05cf856fe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c2ab82886b6241e5a85cbe95942d2347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/474650755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/health_canada_drinking_water_guidelines_turbidity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/47888641650.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/bugelokujenezuxidu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9282/6517/files/bacteria_found_in_water.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f8de3e_bd597bbffdea4a39831efa78513a0e19.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_83b5581846904130aa0d4c35885f5f10.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9734e7_2d8239229e384107b4b5ec5d08996fd1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b42fd6_0fcf07789a444c7dbf4018833458110e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/837d34_d8c96a66496e4cf380691ddab68c87b7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0aab01_b800e848a2ba4406af0131729e6d778a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2274a7_471804ec1d1644f99b42b45fb8bf9360.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f81a524b494b4cceaccf729746aa510e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/271e65_43b24f3b561e4a6dbeaed5fa7bed8b59.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD2 5224 bytes
SHA-256: 98588eaeee3ab457de96015de549883d4cbdc0ff1d09e13a3f66dc5779ccb609
font_01_sfnt_off00006e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E86 11360 bytes
SHA-256: 21a113a5243a7214bee2e16039a1f9e66660b41d48d783fa4041da049fcc50a2
font_02_sfnt_off0000931c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x931C 16392 bytes
SHA-256: e66abfbeddc1d19d92dcb25e98d0a5acfcfed5afa902c0cdbe1883ebc60d8997

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