Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4bc5a0c378dbd…

MALICIOUS

PDF

42.4 KB Created: 2020-08-17 05:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6fd6623e7b4f050ace426502e20433c SHA-1: 98df48af6ab35717a6557c55b462d6aac1f02934 SHA-256: 21a4bc5a0c378dbd1eca8200f365735b900bb6761a60483328ac0a3b8e14c5c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise malicious activity as a worksheet. No scripts were extracted from this sample.

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.ru/pify?keyword=factoring+quadratics+with+leading+coefficient+worksheet
    • http://files.integrativeneurostim.org/uploads/1/3/1/3/131380054/641c6262f4632f5.pdf
    • http://files.novaca.org/uploads/1/3/2/6/132695601/silimujenuveneb_zigejisizo_giniwobuwobanum.pdf
    • http://files.mooserange.com/uploads/1/3/1/1/131164009/def2cf0cc8a55.pdf
    • http://files.catalanstylefinland.com/uploads/1/3/1/4/131438313/vuwuv.pdf
    • http://files.missypierce.com/uploads/1/3/2/8/132816036/3313653.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/fuzajibupaled.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/93600199065.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/korulujavarenugo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/23529771626.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/games_apk_low_mb.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/40342501270.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/28938810142.pdf
    • https://cdn.shopify.com/s/files/1/0447/0459/6122/files/wilipojewozerama.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/samsung_gt-_p3113_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0961/3725/files/42862511252.pdf
    • https://cdn.shopify.com/s/files/1/0430/5462/9015/files/43534235408.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/kenmore_sewing_machine_model_158_manual.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b5.bin
41a3b0e1a7260278e3870416a0430efc9208a10a1c1f02119117e4b1ed812863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 5520 bytes
font_01_sfnt_off00007a7a.bin
e02fd3055b2f79bb57472685b5a9de0c1e13c3a02e0bb33c8389ea0e2c12452f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 9876 bytes

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