Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b8727874c6599e…

MALICIOUS

PDF

66.4 KB Created: 2020-09-17 07:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959a8a03327965341a9f1fa8d6d1174c SHA-1: d3d5f1f716124a9f1d9254742906f11155d00d2e SHA-256: 77b8727874c6599ede7f1e03f63e2a560c1797d1d7176c1e245a585c9ff68be9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a child's passport consent letter, directing the user to the malicious URL. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/wix?keyword=sample+consent+letter+for+child+passport
    • http://files.shopnotjustflowers.com/uploads/1/3/0/8/130814340/fixopopexoba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ec93148-3dba-477c-84f5-74e099782f3d.filesusr.com/ugd/a86d68_5421e781a4f24d088c4ed9c09be261d1.pdf?index=true
    • https://962525ae-b7b5-49a2-ac16-934ede5b7d48.filesusr.com/ugd/1acd69_5880a4905a1a47f188dfb47a103b7118.pdf?index=true
    • https://9c6b2c7c-120f-4ffe-948d-3ed781f03426.filesusr.com/ugd/1e52da_dc701a0317e44ec3aeeff1db6a2eb6c5.pdf?index=true
    • https://2f08d826-c043-4dbd-8d43-17804ad40f85.filesusr.com/ugd/ac8c68_42c5008b251b46e4adc6711081538135.pdf?index=true
    • https://e3590002-e65c-41f8-a0d4-aa84bd971893.filesusr.com/ugd/a9248e_ddc0fabbb0ff4c0f9dc9a9c316db5b12.pdf?index=true
    • https://b989b7a9-e925-4305-afd7-768a170a0bfa.filesusr.com/ugd/952c2e_0eea6a13815f416a9e23e96648a8d8a0.pdf?index=true
    • https://805c467c-ed3c-4dd5-9d25-5ca761d037d8.filesusr.com/ugd/d1c05f_d64a61f38c99479e9fd21106742092c8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tunamowari.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/1332251121.pdf
    • https://cdn.shopify.com/s/files/1/0433/9132/0229/files/16796912082.pdf
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/sidesobosasekizatuxawilu.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_off0000bce8.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 2828 bytes
font_01_sfnt_off0000c6e3.bin
14acac95dd635c6aaee9f99f1e2b13bff89674ef50c58f363bb6d37e7724f261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 5500 bytes
font_02_sfnt_off0000d966.bin
5f64a41e99f8088e9457cce29dfeaa07f8c573573475366f9acad38f5bde28a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10168 bytes

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