Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32e9f0cbd5fdd1…

MALICIOUS

PDF

72.5 KB Created: 2020-10-01 22:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7c56b77a99d21e9f46e2b15f8417d44e SHA-1: e23c2fa4299129eaacbd4cc84744b83ed29ccd1d SHA-256: ac32e9f0cbd5fdd16b454242a84497357f5024b19461bedaa47451f19ddc9089
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. This, combined with a PDF link farm heuristic and ML classification, strongly suggests a malicious intent. The document body, though heavily obfuscated, contains the same malicious URL, indicating it's the primary lure. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sportz+tv+multi+apk+download In PDF document text
    • http://ligetajep.hornedreaders.net/uploads/1/3/1/4/131406925/8120464.pdfIn PDF document text
    • http://kapapajef.first5460.com/uploads/1/3/1/4/131406427/lebupov-faganelani.pdfIn PDF document text
    • http://tivuga.tuxpeoplesmusic.com/uploads/1/3/1/6/131606346/8876745.pdfIn PDF document text
    • http://files.usdinstitute.net/uploads/1/3/1/8/131871704/gakonupuj.pdfIn PDF document text
    • https://site-1039740.mozfiles.com/files/1039740/86718903128.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/38768954674.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/1/0488/2507/3829/files/persona_5_declarer_of_anguish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/uber_code_text_stop_to_unsubscribe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3472/9384/files/nesesovipobijolotokevub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/kajivurewipusiposili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d8778f-da07-410e-8b06-46bbac1f0b6d/bogotejewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e4a82b-623e-4419-a734-483938877d72/dixetediduto.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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 5296 bytes
SHA-256: b56c5061a431d92f946156c206d519001a94506ae165916999bef39f2d59ae81
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 12132 bytes
SHA-256: 6badc8e638a7b004d9405b826141d8e58703001af5973d67fcfe28f40fb19aa0

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