Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c9100484b4990…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 02:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a677a0207ba01702a159ffb58a6ff2cb SHA-1: 9a966e8df98d05d4828a41098502c8dce6c7de85 SHA-256: 5b1c9100484b4990133402e624ba438f2c9f9b520cf213111b03cb0994a28247
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings indicate an attempt to redirect users to potentially harmful content, likely as part of a broader phishing campaign.

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/wix?keyword=best+free+graphing+calculator+app+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/hidden_camera_without_icon_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/16801136311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/pibototukugusamiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/64153121126.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/81961537311.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/anemia_falciforme_tratamento_natural.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/biology_textbook_gujarati.pdf
    • https://static.usrfiles.com/ugd/fe83c3_7269a6410d544bebba1079c093082d10.pdf
    • https://static.usrfiles.com/ugd/b8c837_8858d9293e914f639ef3c5e852b4a3c4.pdf
    • https://static.usrfiles.com/ugd/353d00_8c35e6e73b504435a5c4637ee4d193e7.pdf
    • https://static.usrfiles.com/ugd/6116da_3da69a8698be43499928de8d9aed3807.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/16058242832.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/sisuvemakopedakurixoviwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.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_off0000673d.bin
9c3236c081b86993537dbb3a1f398ebc218cf813881be064d2fa5698359bad8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 5468 bytes
font_01_sfnt_off000079d6.bin
260a28ca10bb895ebc55c93437449ba6f891145dac55b102f04af6de831baa07
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D6 10136 bytes