Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58c27500a3052ac…

MALICIOUS

PDF

42.2 KB Created: 2020-08-03 15:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a74f7112e4d851325f63f6a518abf1 SHA-1: 4eb1cec269aa3607047bc9c7c62d2c70152c965a SHA-256: d58c27500a3052ac91a0dee561bfb3fbe4206d064b2cee2521ac4744f680abe6
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=nouer+cravate+pdf'. This indicates the document is designed to lure users to a malicious site. The presence of a large number of other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=nouer+cravate+pdf
    • http://files.victoriathatcher.com/uploads/1/3/1/1/131164130/2338272.pdf
    • http://files.mrskestin.com/uploads/1/3/1/4/131453156/jaratupozutuburemaj.pdf
    • http://files.collegemoversandhauling.com/uploads/1/3/1/3/131379874/1eeab220.pdf
    • http://files.afhdesigns.com/uploads/1/3/0/7/130775734/5ccca33ac5fccdc.pdf
    • http://files.youngstaekwondo.net/uploads/1/3/1/4/131453823/kuzok_fesununavodu_gugabu_rabuginixujeruz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6010/files/42615409590.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/52207995958.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/13381334602.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/41003165822.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/53918627337.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/16534965170.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/49345534674.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/87069582591.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/nalimusitagaguxeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/38679841764.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nofalefupipalivudekim.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/kisefone.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_off0000668c.bin
cc67d97e6cc50602c1a5c13609b8f05eb023db585658d2f37cbc86f8fbaaaf5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 4968 bytes
font_01_sfnt_off00007797.bin
ea50e79fc1fc0d07c250827832c51d87a8574652ad2712f0c251a43540999dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 11228 bytes

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