Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35bd4a90da654c0…

MALICIOUS

PDF

73.9 KB Created: 2020-08-06 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279c4a038704176aee44d87cae3c1ca1 SHA-1: 3987925a591a65309614a8f4010a506b6d669238 SHA-256: d35bd4a90da654c051658ea7aed004ef81a5ccffc0013f410f993e9b3c718386
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=complete+estimation+and+costing+of+residential+building+pdf'. Additionally, it features a PDF link farm heuristic, indicating a mass distribution of external links, with the first being 'https://cdn.shopify.com/s/files/1/0430/8896/9882/files/accounting_all_in_one_for_dummies_free.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the redirector, reinforcing the malicious intent.

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=complete+estimation+and+costing+of+residential+building+pdf
    • http://files.zerocannon.com/uploads/1/3/1/3/131398477/texuragefebip.pdf
    • http://files.convictionsolutions.com/uploads/1/3/1/8/131871674/rotovuzixaduwo.pdf
    • http://files.bereanwest.com/uploads/1/3/1/4/131406082/3127349.pdf
    • http://files.divinelighthealers.net/uploads/1/3/0/8/130813042/1257501.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/accounting_all_in_one_for_dummies_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/majabedeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/fevetow.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/72609905977.pdf
    • https://cdn.shopify.com/s/files/1/0439/1924/5467/files/66241730469.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/tuwuleri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/16732254907.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/zopabufepilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/nick_anderson_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wojifuxazax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca16.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 1696 bytes
font_01_sfnt_off0000d240.bin
15d84726ae8127d96cf52f813b3ac1b007017f0793124d5293ed3046235e6c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 5520 bytes
font_02_sfnt_off0000e4df.bin
00c294ee0c5afaff5fad6bbc4f992dc1a8f104f3d421c63f058b7f3e8d55abe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 17340 bytes

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