Malicious PDF — malware analysis report

Static analysis result for SHA-256 534b9092de40c8fa…

MALICIOUS

PDF

42.6 KB Created: 2020-08-12 12:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f77e6c06b0e7d6eba8b9ea9c26ad725 SHA-1: 2f8d79d750a66c6f91c45d09471243b596176ab5 SHA-256: 534b9092de40c8fa2414274aad19c6bf20659021108e2361a06e1fafd9814293
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary malicious redirector identified as https://ttraff.ru/pify?keyword=synonyms+and+antonyms+pdf+for+nda. This URL is likely used to direct users to further malicious content or phishing sites. The document body and embedded links suggest a lure related to 'synonyms and antonyms pdf for nda' to entice clicks. The ML classifier strongly flagged this PDF as malicious.

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=synonyms+and+antonyms+pdf+for+nda
    • http://files.lisakleinspeech.com/uploads/1/3/0/9/130969438/3c3f90ab4.pdf
    • http://files.marinegeosciences.com/uploads/1/3/0/7/130738852/1426791.pdf
    • http://files.walkingandreading.ca/uploads/1/3/1/8/131856723/temofirijijajadozepo.pdf
    • http://tetivo.karencourtapartments.net/uploads/1/3/1/4/131406665/buzizijajode.pdf
    • http://files.theunrequitedkitchen.com/uploads/1/3/1/3/131378990/ce98ad0.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/88527373198.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/83799809550.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/zunawamilutenudomopixoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/pumovapejotikogojaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/medivitedizuketanaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/farovakixorizezobo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1092/3423/files/zokixuxovageloxizebobobi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/40623733854.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/mass_of_creation_memorial_acclamation.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_off0000678e.bin
be2ee7992b231dd57d56e73c5bc077f9d68805d3730665df0a8e27e22a427086
pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 5360 bytes
font_01_sfnt_off000079b3.bin
3648a06d37af696f0e74b1b99cad6e0dd94c6d2b45a2d0a226e133aff1ea7f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B3 10520 bytes