Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d498b533c6538f7…

MALICIOUS

PDF

38.1 KB Created: 2020-08-04 02:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6a594b4bc4ef5dae7a3c78d7234751 SHA-1: cdf87fc1c326fe39460fa9943dc28419c8561409 SHA-256: 7d498b533c6538f7589eb9047a601680b3eb3c4f2141ec69f80fb279ff252391
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=texanplus+authorization+form+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking PDF links, suggesting a lure to a malicious site.

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=texanplus+authorization+form+pdf
    • http://files.searangerseafoodstation.com/uploads/1/3/1/4/131408170/forakivepu.pdf
    • http://files.longfellowpta.org/uploads/1/3/1/1/131164260/4d852.pdf
    • http://files.capccpnpalberta.com/uploads/1/3/0/7/130738914/6a3b979fc10b4.pdf
    • http://files.theworkofthesehands.com/uploads/1/3/1/4/131408103/fawebitugejuji-niwazenosij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/pawubojuzexapukeduvala.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/98068786522.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/bolebazesusozug.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/nopowisujiwuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/applied_mathematics_3_sem.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/54433336854.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/90201257813.pdf
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/17267679650.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/kubuluxij.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/difiwonanus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/moxinanabeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/nitagozutiwajezuvitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/62723618899.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/tosozetuzike.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_off0000541f.bin
c9ef855e428edccbf6d53b18444bc507f8af0fd74166d98dbf1fb3cd77fa0343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x541F 5348 bytes
font_01_sfnt_off00006633.bin
28c4ba6f48ca12393d7a85183137a3ecd4d8e4135cc87f025dfd852479e83c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6633 10972 bytes

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