Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c0161f63172caf…

MALICIOUS

PDF

46.8 KB Created: 2020-08-21 21:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e6c4bf38bf96a178c8003ad94284901 SHA-1: 821ae5a4a97d561e3cc4da62a7e2dc9e32883f89 SHA-256: 68c0161f63172cafd4c47fa4378e7d9fd8836ae41bf38e5cc5fd6d837e4dfc83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious redirectors. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure text and URLs as the heuristics identified.

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.cc/pify?keyword=documentation+template+for+programming
    • http://files.kaleenacarter.com/uploads/1/3/0/7/130775115/kukeg.pdf
    • http://files.sharpearedowl.com/uploads/1/3/1/3/131383649/1dfb3f78.pdf
    • http://kadego.truehopehealthyliving.com/uploads/1/3/1/8/131856543/zefofobotiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/rideverezujitim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/25045122903.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/61911626110.pdf
    • https://cdn.shopify.com/s/files/1/0428/8905/2316/files/fanowopi.pdf
    • https://cdn.shopify.com/s/files/1/0461/4841/9747/files/52810480247.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/dark_souls_2_hexes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/sistema_politico_frances.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/91134197666.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/partnership_act_1932_bangladesh_in_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0434/4758/2870/files/69407289691.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/46233779714.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_off00006cb5.bin
cb3c515847e8ae282b90ff7d681e4a6842d658f46f23126f2853839c790a2708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB5 5036 bytes
font_01_sfnt_off00007dbf.bin
97f26d93c3555ea1e453d5efa36be9bf650e8d9f82c289dbd6bafe7855f0b579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBF 10156 bytes
font_02_sfnt_off0000a070.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA070 4324 bytes

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