Malicious PDF — malware analysis report

Static analysis result for SHA-256 8666039f71467ff5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 19:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb10090bfa6d651c20e78376092f16d8 SHA-1: c8f61178d32923ab92ced30b842eb232c1f052ce SHA-256: 8666039f71467ff54d6d418abff876a9af9bcc1b6c5af81178db38af56f666e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to PDF files hosted on Shopify. One prominent link, 'https://ttraff.cc/pify?keyword=english+test+for+3rd+grade+pdf', is identified as a malicious redirector. The document's structure and the presence of the redirector suggest an attempt to lead users to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated.

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=english+test+for+3rd+grade+pdf
    • http://files.puristaromas.com/uploads/1/3/0/9/130969505/nexero.pdf
    • http://files.twfermco.com/uploads/1/3/0/8/130874566/3114318.pdf
    • http://zurax.sjbcatholicschoolredbud.org/uploads/1/3/0/7/130740178/b97f79c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sutapazuvonovojikujabera.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/bosewabewugum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/sapply_vs_lapply.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/seniloduzoxujerefona.pdf
    • https://cdn.shopify.com/s/files/1/0440/0332/8150/files/mc_helicopter_mod.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/78._8_kg_to_lbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/korelesedokarifo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/crown_vic_manual_swap.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/60342382343.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/2741561757.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_off00006163.bin
7acc330b093fb0d202fb1a8096bfcaea7668f097182c1f98cbeece2c096083ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5424 bytes
font_01_sfnt_off000073d4.bin
995d91571647cdd17fae2791cff9c66c5c080ad0f91959b93cfd69c823ef4b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D4 10476 bytes