Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7e88f0d71c4337…

MALICIOUS

PDF

56.3 KB Created: 2020-10-31 03:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb9ef82fd924cf7e632550477ef040a0 SHA-1: 9b703648e9a491c4379d896df8445453a38c70fb SHA-256: 2f7e88f0d71c43376e7d36dd39e2aa22493e18a2fa33c83918b3355c87323c55
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The primary link, 'https://ggtraff.ru/aws?keyword=tamu+meal+plans', is flagged as a malicious redirector. The extensive link farm suggests an attempt to manipulate search engine results or to distribute malicious content or phishing lures to unsuspecting users.

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/aws?keyword=tamu+meal+plans In PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/binusad-penivupuker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f8db8c1ea26c.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/86825.pdfIn PDF document text
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/kibimufafal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f87056eeb418.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/838a7b17535ea2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5f9c3b1135b66.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ratot_muweliwamopoj.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/bavukasagova.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a0741b-bd05-4b07-b3b6-225c321a2c0d/8x8_post_base_concrete.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8544 4816 bytes
SHA-256: 01effd87e6f71534547245dc5d4b7a0a1dc2507965e0ac963c58bfd14593dc27
font_01_sfnt_off00009593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9593 11476 bytes
SHA-256: 88784e075e52e63990f717fe5111a982a5e85920de7a0bec962345c367e40b3d
font_02_sfnt_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 17004 bytes
SHA-256: 366f54d4628eb6737e3dfc08e69b3c817ffade08979a7f506a582e3f3b52c7f2

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