Malicious PDF — malware analysis report

Static analysis result for SHA-256 a627f5bb331c3369…

MALICIOUS

PDF

55.9 KB Created: 2020-09-29 20:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2e28020d08c04a11dca74a9a5ee7255 SHA-1: e7ca07ec9cc9167871a83d6014520438420257b1 SHA-256: a627f5bb331c33694edb641ab10c8b55230e4f2ffa59faea5dffff3c4ac66a2d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be generated by wkhtmltopdf, suggesting it's part of a link farm or SEO spam campaign. The ML classifier strongly indicates maliciousness.

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=cetoacidosis+diabetica+guia+ada+pdf In PDF document text
    • http://files.speckaylighting.com/uploads/1/3/1/8/131857315/8021804.pdfIn PDF document text
    • http://files.tritongymwear.com/uploads/1/3/1/4/131407802/3d85aeb9809.pdfIn PDF document text
    • http://masupimo.wabashfriendscounseling.com/uploads/1/3/0/7/130776299/13a5c6f9.pdfIn PDF document text
    • http://bonan.ruinsofmodernity.com/uploads/1/3/2/6/132681501/baxelo.pdfIn PDF document text
    • http://nefujamok.domicyle.com/uploads/1/3/1/3/131383514/mekunifimebid_nalepikun.pdfIn PDF document text
    • http://gajumadej.creeksidepto.com/uploads/1/3/0/9/130969502/kokeni-vesanuja.pdfIn PDF document text
    • http://files.sportsvisions.com/uploads/1/3/0/8/130814043/fa10325a83d.pdfIn PDF document text
    • http://files.sarareneelogan.com/uploads/1/3/0/8/130813696/5691909.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/0557f423-a167-46af-a0a2-015669f4fcf7/dozopubofudufegoreke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b766c3-e10f-47ff-9f74-3b963de0b3ab/30866710540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3531f9-0de7-4db2-98ac-8c3755f5a4ce/remidukonumugux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1f2232-bf20-4f8d-a079-e630d1a934e2/59080908004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0115/1651/files/3721785221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/rexiperisuvoduzajezilokoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5731/4983/files/16363819581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/nizufiwolonofevu.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_off00008297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 2672 bytes
SHA-256: 0b05425e649f7c306c9a55d096f67f51224c084825c80b7de28bd95c5ac7007a
font_01_sfnt_off00008e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 5240 bytes
SHA-256: 99a5f714dd9b66751998ed61c9fb21ad4d7bccbc6364e799a5001f717e9adf86
font_02_sfnt_off00009fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEE 15848 bytes
SHA-256: b13b81cb968b80427d1abb434095293c5821c2a5ba35a6be0496d90d8a392bee

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