Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca85c7249f3340f…

MALICIOUS

PDF

35.7 KB Created: 2020-08-20 16:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027d955ae7a900ea46501dcea6ecc56a SHA-1: 7801f019e2d0921f41086c593c1a01ccf54c32b1 SHA-256: 6ca85c7249f3340f7caa1866f35296666bebf3c1ee246b03a3f1b3c8bdc237a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other Shopify links, suggesting a link farm or phishing lure.

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.com/pify?keyword=bhojpuri+gana+arkestra++dj
    • http://liwunota.sarah-bass.com/uploads/1/3/0/7/130776485/5350602.pdf
    • http://jibef.jcfarming.co.uk/uploads/1/3/0/7/130776485/5354ea.pdf
    • http://files.zhaolidance.com/uploads/1/3/1/3/131398366/1395acdbf40e918.pdf
    • http://zixina.purchaseofmanhattan.com/uploads/1/3/0/9/130969744/poluvoliripup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7013/6220/files/erosguide_san_diego.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/gixizaboso.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/fifizireguvijetedifetam.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/games_free_kjv_bible.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0737/files/spider_solitaire_apk_file.pdf
    • https://cdn.shopify.com/s/files/1/0439/0869/4171/files/electrical_engineering_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/budapest_convention_cybercrime.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/damodaran_valuation_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/tozunopaxurim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/8181237360.pdf
    • https://cdn.shopify.com/s/files/1/0430/0642/7299/files/xinaxaxizezetilu.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_off000042ff.bin
d31b738728d485966b13a440c332f5c00bdc1ed14acb6c24f27dd3979ec4b8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42FF 5260 bytes
font_01_sfnt_off000054dd.bin
34e2b18e43a02133dd76d41af099eed4e876b207e65b417016609b45e43f5f51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54DD 9072 bytes
font_02_sfnt_off000073df.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 4324 bytes

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