Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8529ac181f719a…

MALICIOUS

PDF

41.3 KB Created: 2020-10-30 19:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4febc685a1328cd031c2ccb09063676f SHA-1: 05e925e102d82e906562d3cb4c3f730967ea3342 SHA-256: 7a8529ac181f719a667846371449d74d39159ecb23dcda20cec95bf5fc306fb5
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The document body also contains the URL 'https://ggtraff.ru/123?keyword=incredible+hulk+streaming+disney', suggesting a lure for potentially malicious content. The presence of numerous links on disposable hosting further supports a link farm or phishing 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://ggtraff.ru/123?keyword=incredible+hulk+streaming+disney In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f94a7f790f09.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/2c4c19.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/wodut.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/tabusulaf.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/2510124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5f989124461ba.pdfIn PDF document text
    • https://jijidiwudop.weebly.com/uploads/1/3/4/4/134481930/f55dd8b61.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/favokepep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/58061804859.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/nilonukotanev.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_off000061df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5596 bytes
SHA-256: 572954cc68acc840fbd57422bf92357c4827315abe84e325f412ac294b86b401
font_01_sfnt_off000074b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 10520 bytes
SHA-256: e7ce4d4c2c7902d9ece18f226adb186af2a2ce948872eeb2b71fed989be6c649

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