Malicious PDF — malware analysis report

Static analysis result for SHA-256 9412a6bd72dbdab1…

MALICIOUS

PDF

79.8 KB Created: 2020-10-09 03:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dc69de357352c7e02f9983c4e00e75f5 SHA-1: e8798b33bd4a71ebfd71ab2fc3abea7d219ded91 SHA-256: 9412a6bd72dbdab157dda137f4abd54026ea158fa5746d8a7106f4f83cd9ad1f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains. One of these URLs, 'https://gettraff.ru/pify?keyword=oakland+coliseum+layout', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure suggests it's designed to lead users to potentially harmful content, likely as part of a phishing or scam campaign.

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/pify?keyword=oakland+coliseum+layout In PDF document text
    • http://files.sentirelcine.com/uploads/1/3/1/3/131380354/7226180.pdfIn PDF document text
    • http://sabemevef.ocgifted.com/uploads/1/3/2/6/132695832/mofiwif.pdfIn PDF document text
    • http://vibusiwi.world-magician.com/uploads/1/3/1/4/131407921/lifigejupujobod.pdfIn PDF document text
    • http://wuzisiw.atplaygames.com/uploads/1/3/0/7/130776760/6507550.pdfIn PDF document text
    • http://mefur.kevinportmann.com/uploads/1/3/0/9/130969895/veludufog_baxuvavom.pdfIn PDF document text
    • http://files.canon-services.com/uploads/1/3/1/1/131163635/11993e9203c02ff.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/fapadikosinezimubozusin.pdfIn PDF document text
    • https://site-1040974.mozfiles.com/files/1040974/94796993812.pdfIn PDF document text
    • https://site-1043121.mozfiles.com/files/1043121/73754626414.pdfIn PDF document text
    • https://site-1042277.mozfiles.com/files/1042277/13724422546.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/1/0480/2117/6479/files/sedugolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7658/2560/files/saddle_brook_schools_directory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8622/8903/files/manual_ipad_1_espaol.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 5184 bytes
SHA-256: f1a07b731c29c0459b6882e827a30bf1d2169287322bc99bd64f7129fbd0ab76
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 14844 bytes
SHA-256: e53a38d7f31ee96367b2effd3b06010c7298fe7071b469bc626206f1c0e3f709

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