Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e3a6b92e827908…

MALICIOUS

PDF

65.2 KB Created: 2020-10-07 07:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6c281ea94f5e8c7c404811e79c0c6bc SHA-1: 3eacc3c7c0cdae1e94bfabfe218de6da216b3014 SHA-256: 15e3a6b92e827908cf34e131ef5d0b48d1570a95a99b561179b8aa3ea172da3f
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and a link farm. One of the links, https://ggtraff.ru/strik?keyword=rhomboid+major+manual+muscle+test, is flagged as malicious. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text and a URL, suggesting an attempt to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=rhomboid+major+manual+muscle+test In PDF document text
    • http://sesali.aiacademy.net/uploads/1/3/1/4/131452976/4490589.pdfIn PDF document text
    • http://tusunate.tanglewoodtollersandaussies.com/uploads/1/3/2/8/132815004/tonotarepiza.pdfIn PDF document text
    • http://files.theconcertspot.com/uploads/1/3/0/7/130739949/454b2dac1a4d18.pdfIn PDF document text
    • http://ludidasu.commercial-doors.co.uk/uploads/1/3/1/0/131069934/f529680afd.pdfIn PDF document text
    • http://files.worksreclaimed.com/uploads/1/3/1/3/131380558/0d9d6f9a0.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/7417820987.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/15095663761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/have_and_have_nots_season_6_recap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3516/7400/files/purdue_owl_resume_objective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9762ee-a914-4ebf-b7c0-c0f047b8bf68/fajigivikogoxumebula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06769c2f-6ba0-4c32-acda-0b4c1a8dbf14/60293466569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0328623-f5f1-45b1-9ffe-ff2c4b7a1cf5/57071579166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c67504-2454-40f6-be3f-e83c5292eb43/diwimolejalesalimex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82fdddd-1ed7-42d3-9d6d-6f255ca7b2d0/19837385714.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 5404 bytes
SHA-256: 1fb19ca961a37620a7571db176dc9af5bffe229947dfa8f7a8595259cccc4f53
font_01_sfnt_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 10068 bytes
SHA-256: 15d1e81f9348b18a2a83e842d4b7318b268f87a00f0124f8fd8dba032af793a1

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