Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d8da90a2ed450f…

MALICIOUS

PDF

45.1 KB Created: 2020-07-30 18:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a27a93996a531342ae3970cd380712 SHA-1: 79fcd97831fb182ae91b8e64052246bd6d2ebd2b SHA-256: 65d8da90a2ed450fd55afd45e70e01386dc029d5f8774b61d145058d13e2ab1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links designed to lead users to a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, appears to be related to a book title, likely a lure. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.com/pify?keyword=bd+chaurasia+handbook+of+general+anatomy+5th+edition+pdf
    • http://files.fitnessbyfortitude.com/uploads/1/3/1/4/131437306/jemitusufosuba.pdf
    • http://files.daminstarr.ca/uploads/1/3/1/3/131383754/9499946.pdf
    • http://files.seastarrock.com/uploads/1/3/1/3/131384414/6101163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/repog.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/27781830484.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/ronajab.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/lukepazonuramot.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/gumubapexetorenojuva.pdf
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/zuzusaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/kubunu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0519/6957/files/marafilak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/14259893070.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/67463546221.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazobezosajage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/lojubupikov.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d32.bin
66f867f5130c358b6b890fafda0eebc61185afa4b76f0fbd7ce9dd8b63f5bf81
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D32 5932 bytes
font_01_sfnt_off00008138.bin
ecd5830ee804fb12bee8fb5005de2faa278f4a07060af2cea6167eb16e4e571c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8138 10976 bytes