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)
MD5: 7c7a3a4d08fd3ba51e661802a2cd27de SHA-1: ef321673b9fb175ecf5c91068b69b77ac274d518 SHA-256: 550fd6dcce0b73fbf6fa9de9c22db3840d1d74b2b687bcf51fcdea1343e0ada9
128 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.

Heuristics 4

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://static.usrfiles.com/ugd/cc03df_a8256b46d1164f1790419aa05cf856fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2ab82886b6241e5a85cbe95942d2347.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/474650755.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/health_canada_drinking_water_guidelines_turbidity.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/47888641650.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/bugelokujenezuxidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9282/6517/files/bacteria_found_in_water.pdf
    • https://static.usrfiles.com/ugd/f8de3e_bd597bbffdea4a39831efa78513a0e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_83b5581846904130aa0d4c35885f5f10.pdf
    • https://static.usrfiles.com/ugd/9734e7_2d8239229e384107b4b5ec5d08996fd1.pdf
    • https://static.usrfiles.com/ugd/b42fd6_0fcf07789a444c7dbf4018833458110e.pdf
    • https://static.usrfiles.com/ugd/837d34_d8c96a66496e4cf380691ddab68c87b7.pdf
    • https://static.usrfiles.com/ugd/0aab01_b800e848a2ba4406af0131729e6d778a.pdf
    • https://static.usrfiles.com/ugd/2274a7_471804ec1d1644f99b42b45fb8bf9360.pdf
    • https://static.usrfiles.com/ugd/b8c837_f81a524b494b4cceaccf729746aa510e.pdf
    • https://static.usrfiles.com/ugd/271e65_43b24f3b561e4a6dbeaed5fa7bed8b59.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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