Malicious PDF — malware analysis report

Static analysis result for SHA-256 18afe5717e34b02e…

MALICIOUS

PDF

44.2 KB Created: 2020-10-09 07:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7876e056874b2eff53efb1ec8f3b7fa SHA-1: 9c3afc29e07b40908454e35db298204340e4c918 SHA-256: 18afe5717e34b02eea21fdb8383ec661b193d945968591e9219b52bbd9f88918
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious infrastructure.

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://gettraff.ru/strik?keyword=life+is+a+highway+tab In PDF document text
    • http://vagutegi.zenmeditationgarden.com/uploads/1/3/1/4/131406861/gajafifutekulimaror.pdfIn PDF document text
    • http://files.multiscalar.de/uploads/1/3/2/6/132682790/jazinira.pdfIn PDF document text
    • https://site-1041086.mozfiles.com/files/1041086/14699555529.pdfIn PDF document text
    • https://site-1043541.mozfiles.com/files/1043541/xafowidikera.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/48103334807.pdfIn PDF document text
    • https://site-1040341.mozfiles.com/files/1040341/59317085654.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/3186ef83-4020-436d-9617-a9408496ba86/bepuwowizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99bd168-0fbb-49e7-af17-b3d07d06fadb/sesewufamuwid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d7a327-44c8-41fd-ab11-c7af3cc580dd/najobipilemawidiponaxiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47647208-30ab-4a47-8a54-4e17fe7bf7c1/mewidivegokisedojufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c6370c-04dc-4d7b-b4f3-dc57450b6e46/32670826803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1414/3131/files/49597149625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1873/0902/files/diplomatic_farewell_letter_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7043/8555/files/theory_and_design_for_mechanical_measurements_5th_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4669/8649/files/black_butler_hannah_cosplay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9192/2596/files/88058362217.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_off00006c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 5176 bytes
SHA-256: 6dfdf2b1db21e5db8fac4c7d47cd08b578d78da0c88ac470ae1a59fb6ad5d996
font_01_sfnt_off00007e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 11328 bytes
SHA-256: 64c5b94b95bb667f40604f305150315db208509d8bee07d3ee6407c15dd61479

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