Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539bbc1f2aaecfe…

MALICIOUS

PDF

58.7 KB Created: 2020-08-29 21:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 413fba91dc2c3ac64038fa0d369b6634 SHA-1: 299738e46c83f16307e4a962575b74db58a23ed2 SHA-256: b539bbc1f2aaecfe36460356761d78036b7f9164aacefd063bc2f4822aeae51d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a redirector to malicious infrastructure, masquerading as an application letter. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the primary URL leads to known malicious redirector infrastructure. The 'SE_INVOICE_LURE' heuristic suggests a social engineering pretext. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/wix?keyword=application+letter+for+teacher+in+ma In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/juroja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3301/9047/files/ratavab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/architectural_digest_france_2020.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_64ccf810d82c4e95b00fd7b0f7cf879f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6f53ec0b69594ddd80c7ee7099861fe4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_facd8f0f98a144e2b13d908f4d4011ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cf0f5_dc8d05c0b8204608abaddefeb6e3e618.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6eb6c193ad904bc6abfbbe9ed62d48d8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/guilty_crown_episode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/r_rajkumar_sogs.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

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_off0000a13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA13E 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off0000ab39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB39 5068 bytes
SHA-256: 8eae3e2849d5bbdd725437c3a5f3d9699f06570e0e8f9d416d8dd304e2ae605e
font_02_sfnt_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 9748 bytes
SHA-256: 54a2e0b10abfa21c7b6920c9dc5ce3fef1011266b59a24d6057fcc6b4d31f7cb

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