Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a40cc7708296f8…

MALICIOUS

PDF

37.1 KB Created: 2020-10-05 13:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3178c3b23c7153f4ff9e2878ccc4e0ce SHA-1: c262173db2980da9bd5193bd0cabaf65c94e7881 SHA-256: a6a40cc7708296f8c88e856bccf09ec792141499b1d67daec827c327145b8f5e
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to manipulate search engine rankings or distribute traffic. One of the primary links, https://ggtraff.ru/strik?keyword=indefinite+pronouns+exercises+with+answers+pdf, is identified as a malicious redirector, suggesting the document is used to funnel users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=indefinite+pronouns+exercises+with+answers+pdf In PDF document text
    • http://files.sos-socialmedia.com/uploads/1/3/2/6/132682204/guvozibize.pdfIn PDF document text
    • http://xulil.neilpresleycox.com/uploads/1/3/1/3/131379803/5cff645b81.pdfIn PDF document text
    • http://files.pycap.ca/uploads/1/3/1/8/131857152/pamodetu.pdfIn PDF document text
    • http://files.coalitionforanimals.com/uploads/1/3/1/4/131410939/sajibuketuxododosupo.pdfIn PDF document text
    • http://files.fauquiercommunityband.com/uploads/1/3/1/6/131636618/lerakukem-pudoxag-mivuzan-rokipuniwoj.pdfIn PDF document text
    • http://files.animalmedicalclinicsawgrass.com/uploads/1/3/1/4/131407547/f11fae6ffa114.pdfIn PDF document text
    • http://files.thegintinbar.co.uk/uploads/1/3/2/6/132682549/zekozuju-guritexokosor-zugili.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/1/0429/4619/9711/files/18813051464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0629/8776/files/nagoxanutiwosedutivixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6656/8087/files/35439354207.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2370/7545/files/sofox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35aa076c-3c0f-4059-9389-de81f73f3b6c/zukotodujagilokoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6bd304-1ccd-44ca-9cf9-38eb6e3fd006/desamemomivibenusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96a21a1-5c20-4c5f-a58b-07f736581191/movozizukudowiporili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb973ce-4c6e-4e1f-9843-3bc155773362/sigobufowirozikirabiner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6bec09-7786-4bdc-82af-bb3efb6d813b/78787245145.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_off000052a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A1 5308 bytes
SHA-256: e44f7d202554cc00bb1c8fa9d5c5c8524d02478a8c1aa7aa50bd5266e71d83fc
font_01_sfnt_off000064c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C8 10068 bytes
SHA-256: ba8cfd22f6aafac84d544008d1ccfbfb4b35c35491bc3869fb744c153edd68eb

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