Malicious PDF — malware analysis report

Static analysis result for SHA-256 7919addbb1d2ec70…

MALICIOUS

PDF

115.8 KB Created: 2020-10-10 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63ce1af2edca12e87a6701a8a8ae2d66 SHA-1: fc664ade17e74122ad443084fd84df893d9af5c6 SHA-256: 7919addbb1d2ec7021408f5ed7935f6d7b9416c990dbff596bb432cb3d88a12d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The primary URL, https://cctraff.ru/strik?keyword=intro+chr+6753+xl, is flagged as malicious. This indicates the document's purpose is to lure users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/strik?keyword=intro+chr+6753+xl In PDF document text
    • http://xagot.congressweek.org/uploads/1/3/0/7/130738799/dfb75020.pdfIn PDF document text
    • http://vawuze.heartburstman.com/uploads/1/3/2/3/132303035/rajalesibuz.pdfIn PDF document text
    • http://tixexagom.bookshelf-bookshelf.com/uploads/1/3/1/4/131410818/586c44b.pdfIn PDF document text
    • http://files.greenmantlestudio.com/uploads/1/3/2/8/132814371/6345821.pdfIn PDF document text
    • http://files.mrgysbers.com/uploads/1/3/0/9/130969061/tixiviroborux_titadavu_lakidumutugub_zalumapotisu.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/74504812736.pdfIn PDF document text
    • https://site-1038975.mozfiles.com/files/1038975/lopobugumuvowerolito.pdfIn PDF document text
    • https://site-1040575.mozfiles.com/files/1040575/46464136272.pdfIn PDF document text
    • https://site-1039886.mozfiles.com/files/1039886/vikosonojunugubazepuk.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/cf762b2a-a263-47fb-b247-bae7f61d8827/56565468390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9257b270-80e7-4977-b3be-afa6cf0bfd4b/bilojunisizapodusoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b2e6ab-bc03-4b6e-a28e-7f24e4296a8b/wuvipigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c790c8e-1b1d-42e8-b4a7-770eacbc5880/dururodabosilaniguxadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/defed677-d9c0-43c8-91c4-31801dd6eeb8/fepomonuwawafasera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/nekawugufuvifazarinajor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/midsummer_nights_dream_no_fear_shakespeare_act_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4518/0824/files/62099385544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/16784487834.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3047/7472/files/68992630896.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B3 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off00016fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFF 1560 bytes
SHA-256: b00ecd19090880924020417d584841e792181d3f8e6e7223e17d4fa9026fc8a8
font_02_sfnt_off000177ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EF 5024 bytes
SHA-256: 4c41385736bfd44a43959c2430dc3c29eb635adb206aa114d8ace9a18dec97db
font_03_sfnt_off0001890c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1890C 17552 bytes
SHA-256: 2dedcdf8deb1f4e1d8e89249f6bef75e1bc388136f7cc7af9bcf398ddf0131ca