Malicious PDF — malware analysis report

Static analysis result for SHA-256 8831aac43e55e498…

MALICIOUS

PDF

47.8 KB Created: 2020-08-22 23:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265ad56a0ab01be969abfcdb45003d2f SHA-1: a6353af12a9b9486eb9cf6aa7a13976e60e15e96 SHA-256: 8831aac43e55e4985b162364aaa46af7700ada92e04da2b7040e3414b43b75d8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking on potentially harmful content. The document body, though heavily obfuscated, contains the same URL and references a game, suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many hosted on Shopify, indicates a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=catapult+king+game+free
    • http://files.thehobknob.com/uploads/1/3/1/6/131606111/zepifabelefikumok.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/buwejobexemi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/essential_oil_safety_robert_tisserand_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/wazewaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7723/8945/files/ts-_2000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/816976427.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/administrative_management_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/caracteristicas_del_aprendizaje_colaborativo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6110/7096/files/anterior_knee_pain_scale.pdf
    • https://cdn.shopify.com/s/files/1/0432/2279/4395/files/pabesa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3997/3788/files/dam_laga_ke_haisha_film.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/irs_form_6252.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005089.bin
8a36307a9c867387b2540491ef5f1d4eb27a727329df0edf989c618f05080848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5089 4904 bytes
font_01_sfnt_off0000611b.bin
21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 1936 bytes
font_02_sfnt_off00006a5d.bin
3e6f409fdb8a6d71f03174f198d1a05fa2692c01a479f0fccaafeef45c021257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5D 10096 bytes
font_03_sfnt_off00008d23.bin
c9467bafe2ad4eeecedc4a172479e9b91ec40917f21c2b5e48f786d1f2c9f916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D23 16728 bytes
font_04_sfnt_off0000a3c0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C0 4324 bytes

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