Malicious PDF — malware analysis report

Static analysis result for SHA-256 049af1fc699959e1…

MALICIOUS

PDF

41.3 KB Created: 2020-11-09 16:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c5c7c0b0fe955b2c44bb5cf2cf6d4ae SHA-1: b8f58619f32185db0be71b8e53974e666d7989c9 SHA-256: 049af1fc699959e112656afc82ebd8810c44f855e1b17f20a5255b3ea2e888ab
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of external URIs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially malicious or spam content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=gold+beyblade+burst+qr+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f90a22361063.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3852003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f9a158838c3d.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/wokute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kokesatodixon/storm_ops_4_hacked_unlimited_ammo.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/boris_malenko_stabbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21d6676-c3cf-41f2-b050-653f3bdd74d5/9295005253.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/vibopozalorawiwagomob.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/youtvplayer_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/pewajijusasu.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/walmart_pharmacy_prices_pet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/soxores.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/club_penguin_rewritten_unblocked_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5060 bytes
SHA-256: bb91d3166c735c3fc3e54de222cf8c109e63da54f69b9aa1548b9417c149ec4c
font_01_sfnt_off000066f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 10404 bytes
SHA-256: bae4672d10bebc25f228db3c3681b7c5bcd975d310a8cb921ecfba961a1feda0
font_02_sfnt_off00008a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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