Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa8dc577e7515d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 16:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fcb208e8cb75444b2b976d8c45e76f6 SHA-1: d69fb281e7adb2e3cb10c20a679d84f5c0d44f05 SHA-256: 0bfa8dc577e7515d5151ebc31cc3c305bdf754bd0b13be49d289e2355cb8753f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as an application for leave format. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous other PDF links, suggesting a link farm used for SEO manipulation or distributing malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

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=application+for+leave+format+for+college
    • http://files.watchedproductions.com/uploads/1/3/2/7/132712093/watubazitiwaxiloxobu.pdf
    • http://files.steamworkskidslab.org/uploads/1/3/2/6/132695401/wuvigadeke.pdf
    • http://files.mulvaneystudios.com/uploads/1/3/1/3/131380420/darewunuk.pdf
    • http://files.the8thcountdancestudio.com/uploads/1/3/2/6/132696335/xakixefumiwuniso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/51558517015.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/dr_horrible_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/67273202969.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/46963430062.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/capsule_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xifuworuwitijelasaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/osu_minimalist_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/91783511437.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/20458862413.pdf
    • https://cdn.shopify.com/s/files/1/0447/8690/9341/files/metformin_850_mg_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/84685462366.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_off00006225.bin
341d946ffe55f21d58cfbb60332fd47c1ec2ba0c010ce45dcd8cfb28de468061
pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 5204 bytes
font_01_sfnt_off000073c8.bin
b5b90cdd0a8b3c6234dad33893ae4b015badaa165d6bdbb5cdc413415e9325e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 9796 bytes