Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4de6563ee56f02…

MALICIOUS

PDF

40.3 KB Created: 2020-10-06 11:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 34304b55cb1fc13d1fd1663318dead8e SHA-1: f87c3b87fc6e69b2f840b629244a3637f5eb4091 SHA-256: 9f4de6563ee56f025e5388fe07ea312b9b6057940cf3f6aa47f4d4dfc270231d
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external websites. One critical heuristic identified a link to known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=holy+quran+colour+coded+with+roman+english+transliteration+pdf`. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning attack designed to redirect users to malicious sites.

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://cctraff.ru/strik?keyword=holy+quran+colour+coded+with+roman+english+transliteration+pdf In PDF document text
    • https://site-1042287.mozfiles.com/files/1042287/60051517576.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/52988330932.pdfIn PDF document text
    • https://site-1039929.mozfiles.com/files/1039929/sidaxazubetivam.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/64405672042.pdfIn PDF document text
    • http://zukavafit.ahlatemple.org/uploads/1/3/1/3/131380828/nogej.pdfIn PDF document text
    • http://files.diamondavestudios.com/uploads/1/3/1/8/131856380/2039366.pdfIn PDF document text
    • http://files.frommairpad.com/uploads/1/3/0/9/130969966/wurewe_banonirevibu_jojajivi.pdfIn PDF document text
    • http://files.history-lost.com/uploads/1/3/1/3/131380415/8b464e0.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/kavagi.pdfIn PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/39397121083.pdfIn PDF document text
    • https://site-1043288.mozfiles.com/files/1043288/ziwulokoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5393/6540/files/tezovod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/7284/1638/files/td_garden_seating_chart_jonas_brothers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9357/6862/files/61861147567.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_off00004fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB6 5732 bytes
SHA-256: d7ab52f93af4d8b919c549e22347a5cc5a82d2574aa0c68815e53c06827cbc9b
font_01_sfnt_off00006316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 10036 bytes
SHA-256: aae17b755e41a47ce391ea66b4f3d10b1290f09f120f952fa39cc56c7622d4b7
font_02_sfnt_off0000855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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