Malicious PDF — malware analysis report

Static analysis result for SHA-256 770395ada82f2820…

MALICIOUS

PDF

42.5 KB Created: 2020-08-25 00:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a55a31343a189541b936839940fd4c09 SHA-1: da55194afc7ddaafe935039747dc010e6a0a2d69 SHA-256: 770395ada82f2820b50e0f23fee90f081ebcb7e667183764433de144643b9d93
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body also contains a reconstructed URL that leads to this malicious domain, disguised as a worksheet download. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting a broader campaign to distribute malicious content or traffic.

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=equation+of+a+line+worksheet+pdf
    • http://rikekipep.trinityclaremont.org/uploads/1/3/1/3/131384403/kukuxuninazapo-jujufo-vabubeserol.pdf
    • http://files.rg4ed.com/uploads/1/3/1/4/131436967/zotiwe_xolikek_wolidamu_rufob.pdf
    • http://bituxose.qbmusichub.com/uploads/1/3/1/4/131483453/afd652084.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/big_5_personality_test_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/dupokuleworuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/29888316705.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/zigiluzake.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/gotezujozezovejugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/xajelejumunavotavule.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/kodoforanaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/ladawutedujixatuwunuxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cea.bin
e2f3f40f4f26c10b7744f22f701439f4f3dfe912cf818f1e834db921614360f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEA 1820 bytes
font_01_sfnt_off00006572.bin
04063615907f4c75454a482e1c8604f68c9bec77c905c103f5a65b1abf5af453
pdf-font-stream PDF embedded font (sfnt) at offset 0x6572 5368 bytes
font_02_sfnt_off000077c3.bin
d4e0c977ece98de1b96adda905e99816ca0fee0d8651b917ff49cf7f73fddc58
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 10972 bytes