Malicious PDF — malware analysis report

Static analysis result for SHA-256 318fec6ffa6e227e…

MALICIOUS

PDF

41.3 KB Created: 2020-10-09 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48fadba3903f28b5fe613521df260b7b SHA-1: 5156065499dff533f5059582dcda43cad224a6c7 SHA-256: 318fec6ffa6e227e1298167cd9f97b30e26526062a4af78aca0a25fcd934aa63
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector infrastructure, disguised as a free download for a "Hummer h3 workshop manual". The ML classifier strongly indicates maliciousness. The document body and embedded links suggest a phishing or malware distribution attempt, likely using a link farm to obscure the final malicious destination.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=hummer+h3+workshop+manual+free+download In PDF document text
    • http://zepovez.valdeckerphotography.com/uploads/1/3/1/8/131856331/togopagi.pdfIn PDF document text
    • http://files.speedwayandroadracehistory.com/uploads/1/3/1/0/131070309/9782484.pdfIn PDF document text
    • http://vuzufagop.satiramquarleschristiananthologies.org/uploads/1/3/1/0/131070450/giwiv.pdfIn PDF document text
    • http://files.koenslootmaeckers.com/uploads/1/3/0/7/130740232/5f4a659371.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/fafaad96-4a66-48d5-b940-08c771eb7f1a/55998559827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af8d25d-afda-434f-84fd-47a2a96a8cf3/38775575199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea95342-f8f1-4325-8eab-775b5862f2bc/39765649461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d44c2a9-92e0-4187-a251-dab8b28f2f6f/60334827620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764f2873-6915-4cad-9b6c-b617d3643df4/32363120976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5312/0664/files/bob_and_tom_cast_jessica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/zogulepoxoseg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4881/9611/files/violet_identification_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5619/6515/files/iron_golem_dark_souls_weakness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2345406d-bae2-4b18-be12-be1a2af4ab6c/xugumosajepojumuwawut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cd376e-264b-4960-a65d-bc64412d2af4/rezanoponimabawujuworojav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe6744a-941b-4181-9be8-4e5f2b58dea4/kugizidudomolovad.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_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 5564 bytes
SHA-256: ec25abd9179e45c3e8cb32f1ef7595d22c872a41f1ed097820e539c478b4420f
font_01_sfnt_off00007612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 9976 bytes
SHA-256: 5969ab3e7042def1f8acd52109d70178196a4251a1567db17a8df1de42dfed84

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