Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a4d62544c1168e…

MALICIOUS

PDF

42.8 KB Created: 2020-09-05 22:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28462fc3920559b073fa490f5f66f234 SHA-1: 295cf477b520fd619bdc2a514f7904f6dd3f3218 SHA-256: 51a4d62544c1168e124e4e4ba518578745359bb602bda5222b950044d30b0093
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL is `https://ttraff.cc/pify?keyword=autodesk+sketchbook+all+brushes`, which is flagged as malicious. This suggests the document is designed to lead users to potentially harmful content, likely as part of a phishing or scam 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.cc/pify?keyword=autodesk+sketchbook+all+brushes In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/33a16d_54244b1ca4fe405f9e850844dd32916d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d01287_316695e281184637bb2620e8b898b7cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/12f4eb_06d8751a9cd540e48be6430f7037203c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0994f9_057c4d26c3fc40f68a52deffe3d44600.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/868401_ec08f6f2fa984d1297e40bdb51e54f95.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/33a2e4_1e47b6aac30f45f08313dd1928a3db25.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/24853a_ca669f7315ef4de091188e1f28b4f392.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/db93e9_7439ec6e3fa843118e62289d3e5f8f90.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cf14a4_8181e550b7544782acd360b3e20725c9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70a38d_5b2964744a7642e5a06af8b896f92786.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bdeb4c_fb16110a2a2f494394580c8e5b3636d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/113e89_b3c6937959a1446294eb707fb24b01cb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 5220 bytes
SHA-256: e443401be71633344b02ed16e337f590be1c535cda712ec4899ce2742adfaa5d
font_01_sfnt_off00007447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 13232 bytes
SHA-256: 879694e5ae8d14df4d748226d3dd9bca4b78c0f150d34ce40b1a3dd303cf9170

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