Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9a076af398076f…

MALICIOUS

PDF

39.7 KB Created: 2020-08-01 15:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa031fe506d60f298066ed7f2b16ac9 SHA-1: 54639f3d906286a737c55adfbf3ee2c61ef2026d SHA-256: 2f9a076af398076fd85921c14556fbebf53116b3f3e1fce955b76bb817274100
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://ttraff.ru/pify?keyword=lower+your+expectations+lyrics, which is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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.ru/pify?keyword=lower+your+expectations+lyrics
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.puffpuffpasssmoke.com/uploads/1/3/1/3/131398555/jepusatas-jowiw-rabuferojiferow-wesarawiligo.pdf
    • http://files.wrm-designs.com/uploads/1/3/1/4/131452982/tevez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/satokusetinabut.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/17731077085.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/52353844698.pdf
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/88363710046.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/ziwedulafofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/transfer_dropbox_to_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/21104098641.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/93096244833.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/jiziguzikusutuxolez.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/30681623796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/36335335374.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee4.bin
9328e5b076b3f000ab44a4b1a370f6cb8f47d7afc39a7897e396f65efb5d133d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE4 5128 bytes
font_01_sfnt_off00007086.bin
6b00a163bdee1df1f3578078042d4bd5618f2813dacf8da3c3891add3bf77511
pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 9716 bytes