Malicious PDF — malware analysis report

Static analysis result for SHA-256 257c2388795112bb…

MALICIOUS

PDF

44.0 KB Created: 2020-08-08 21:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d70072983c7b507460946c1f46844f6 SHA-1: 9796b4fd514ad3af5938fbd433b62a1aa6ecfc29 SHA-256: 257c2388795112bbf264fcc11dcf41b7307a0c90d65a6d40cc91e90a0d18e03f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at ttraff.com. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=deskripsi%20hydrilla%20verticillata%20pdf
    • http://files.trishhermanson.com/uploads/1/3/0/8/130814346/b7407d97.pdf
    • http://baminum.sacredsecretskincare.org/uploads/1/3/1/6/131636725/bivepidora.pdf
    • http://files.leonardpaul.com/uploads/1/3/1/4/131406659/zufibalufuvo-wuzime-lunegitudinije-vokisevoduxaro.pdf
    • http://files.faststeamboat.com/uploads/1/3/1/0/131070688/zezemukojavufob-kixavizisozip.pdf
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/fawanokumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0968/7208/files/29682071925.pdf
    • https://cdn.shopify.com/s/files/1/0435/9615/2995/files/5193717913.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/57102350077.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/mupadulutetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/fast_mouse_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/basic_electrical_engineering_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/26131010724.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1333/files/sentry_safe_factory_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/multivariate_statistical_process_control.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1062/files/33612818407.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/payroll_check_template.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_off00006d8a.bin
b564ce4035eab5f1b8a707c381e3b1bf7d2ebaeb0509b82d27bac348c6169f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 5468 bytes
font_01_sfnt_off00008037.bin
905e6f3873feca01d729890f239171004d92e0aef4678fe3acce4e8587da0c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8037 10208 bytes

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