Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fdb772d1c1ec0a…

MALICIOUS

PDF

53.5 KB Created: 2020-09-30 19:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b5e190774a2552d958ba8a9b8530471 SHA-1: f7aeac3703327f600b723e2f64ff123b0a767623 SHA-256: a6fdb772d1c1ec0ad86cbc8b53df8c26d87370036af8f228009aa8e2894514d1
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/strik?keyword=methode+pour+apprendre+le+piano+pdf In PDF document text
    • http://files.truevineccwy.com/uploads/1/3/0/8/130813757/02291a062.pdfIn PDF document text
    • http://files.highhorsetn.com/uploads/1/3/1/3/131379938/kuputukituno-pebuzovux-dixide-dujumobope.pdfIn PDF document text
    • http://kurebo.wolfesearchgroup.com/uploads/1/3/1/8/131856979/e1354ee0598.pdfIn PDF document text
    • http://files.benevaanimalhospital.com/uploads/1/3/0/7/130775679/wekogazurikevitiz.pdfIn PDF document text
    • http://xejis.thecornerstonemarket.com/uploads/1/3/0/7/130776728/zamikisuf-fimiwumubikuwil.pdfIn PDF document text
    • http://werirutuv.thephillypad.com/uploads/1/3/0/8/130814407/bcc7b8f.pdfIn PDF document text
    • http://files.g-gees.com/uploads/1/3/1/6/131636808/5765977.pdfIn PDF document text
    • http://files.tritherapymt.com/uploads/1/3/1/3/131397930/a9bac.pdfIn PDF document text
    • http://zurememid.jsaadsales.com/uploads/1/3/1/6/131607131/jedogiwewe.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/1/0439/4831/0683/files/4322819698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6033/3206/files/dotabulemubufedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1254/9540/files/94282957958.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 4956 bytes
SHA-256: 98de698db6892a77dbd1ff999041d7680d51ca6a2832bd2896fe1d76d9a0e005
font_01_sfnt_off000085f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F7 2052 bytes
SHA-256: 45161600c168cb86abea0d582939cff7e26865ccef696145a84b56b2745b4fe2
font_02_sfnt_off00008eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 12268 bytes
SHA-256: 149fbd30ec4b4a215abbc9265da048df660801d488efd6e9d97dda8119827ccc
font_03_sfnt_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 16700 bytes
SHA-256: 22b3bf9ba7facadb0d78a9932b84d5c890ff9e3e9c0bd5cfcc8c0a5ae7f44963