Malicious PDF — malware analysis report

Static analysis result for SHA-256 7637e99181af6102…

MALICIOUS

PDF

52.5 KB Created: 2020-08-20 11:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fc7803b794aca5f7e72e83ab75cd3f SHA-1: f4a07960196919aacccd8d9ec402640941cc657e SHA-256: 7637e99181af6102706fb8a651233d7fbf2a104cef2b4673369337548c412940
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic to disguise malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is part of a lure to trick users into clicking the malicious link.

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.com/pify?keyword=bangalore+university+bsc+computer+science+syllabus+pdf
    • http://tifapibug.nwraincreations.com/uploads/1/3/1/3/131379608/4229312.pdf
    • http://ranusim.romanacoutureshop.com/uploads/1/3/0/7/130775362/pesidaxetukul.pdf
    • http://files.indianaties.net/uploads/1/3/1/3/131378993/xatefenu.pdf
    • http://nemedivo.afrisekgroup.com/uploads/1/3/0/8/130814328/8f469.pdf
    • http://files.rohanbopannatennis.com/uploads/1/3/1/8/131871687/3672773ff49c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0541/9418/files/bosch_ebike_connect_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/0399/2474/files/tojiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/biogas_plant_working.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6495/files/8047292994.pdf
    • https://cdn.shopify.com/s/files/1/0438/1900/8160/files/xemakakaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/41886863244.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/77424916687.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/feginurozexofobivobalaxiv.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_off00007fc5.bin
c1c55e7f94408331e927f13502faf211fa062212f8c832d289288e5b01657ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 5824 bytes
font_01_sfnt_off00009391.bin
6ce33b619fa21b73cab0bf76f7e38e117f42ebbf674415df526b46b3b46d0805
pdf-font-stream PDF embedded font (sfnt) at offset 0x9391 15120 bytes