Malicious PDF — malware analysis report

Static analysis result for SHA-256 64617075fb9deb5e…

MALICIOUS

PDF

36.4 KB Created: 2020-07-30 10:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4939e2e2e6453774975163ad28aaa07f SHA-1: 2c660f84234229847ab64cd70f19fdf44573326b SHA-256: 64617075fb9deb5e84ff017498d18d344443a9e722c0723cd58f044d58ae5c5c
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. The ML classifier also strongly indicated maliciousness. The document's content and structure suggest it is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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=blank+answer+sheet+1+200+pdf
    • http://files.wapentakeleeds.co.uk/uploads/1/3/2/6/132681316/9631786.pdf
    • http://files.themechatroniclibrary.com/uploads/1/3/1/3/131379594/c9bd62.pdf
    • http://files.momnovel.com/uploads/1/3/1/4/131482958/3656597.pdf
    • http://files.mackeiganmarketing.com/uploads/1/3/0/8/130873839/8386677.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/linafejatujonavosit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/fibukij.pdf
    • https://cdn.shopify.com/s/files/1/0438/1274/9469/files/78701737565.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/38650348651.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/zimapipodogibilosuvuwuter.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/65259960525.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/zexewabug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/sufedinijarebejedixuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/kafonelotowoxiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/jiperumudutalew.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_off000052f8.bin
dcf002bdfc49864183014ea2af06e0500cd9fd0cc82cce74bab59dd6f01b418a
pdf-font-stream PDF embedded font (sfnt) at offset 0x52F8 5288 bytes
font_01_sfnt_off000064fc.bin
08e064ddb2898dae835107ee9a34b45c7422ec9cefd0b5c4c5b5b5d6707a0755
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 9240 bytes