Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9b057ea2180627…

MALICIOUS

PDF

57.2 KB Created: 2020-08-25 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5883496b8e7ea8436e1d807edaa2343 SHA-1: bd5740a00d9f2d2571dbe2b7f21520da117564b7 SHA-256: 6d9b057ea218062740a57aa763d8cdfd65bddb337783cdcbb65965d70be8155a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a redirector service. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that this document is designed to distribute malicious content or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. The presence of a lure for MFA or one-time codes further supports a credential harvesting intent.

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://ttraff.ru/pify?keyword=striker+leveling+guide+bdo
    • http://mupuj.howesenglish.com/uploads/1/3/2/3/132302842/5896551.pdf
    • http://vexoda.sgguardian.com/uploads/1/3/1/0/131070767/24241807.pdf
    • http://luzobaku.anncottrellfree.org/uploads/1/3/1/3/131380005/6e14e0.pdf
    • http://files.whiskersnwagspet.com/uploads/1/3/1/4/131453006/rividebogewokebut.pdf
    • http://pomova.kitchenettecuisine.com/uploads/1/3/1/8/131856005/627316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/anydesk_for_ubuntu_16._04.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/69628669640.pdf
    • https://cdn.shopify.com/s/files/1/0437/0586/0248/files/gopabo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/52562163365.pdf
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/toxocara_canis_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0437/1067/7141/files/create_database_in_postgresql.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/53855307986.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5676/files/kojexifopixadejironelem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/gate_2020_aerospace_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/66458922288.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/69110933237.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/24793499366.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009986.bin
624d55a06cfa3ae4fcf5ffce21e941c2d01d52a5d7579317bc0a302ba3f51c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9986 4972 bytes
font_01_sfnt_off0000aa73.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA73 1800 bytes
font_02_sfnt_off0000b301.bin
07d076a6b09c199f3d29d5f4d7f605597790bd8129a843903ee532f3c19aed54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 10636 bytes

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