Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a924921bfb30c6…

MALICIOUS

PDF

48.1 KB Created: 2020-08-18 16:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 113b43f9664567c110d5df5f966bb246 SHA-1: a95e9d0c8f774c48f6497360d12100eee97b509f SHA-256: a1a924921bfb30c6bff4441107308d30135b4b4b6b98fb87a6779f0033ab14ac
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=internet++speed+for+gaming'. The document body, though partially corrupted, also contains this URL and mentions 'Internet speed for gaming', suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination.

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=internet++speed+for+gaming
    • http://zenisav.teamagapekenya.org/uploads/1/3/0/8/130874123/vuvifuzosipanetezoku.pdf
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/fack_eminem_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/planescape_monstrous_compendium_appendix.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/p30_chevrolet_motorhome_chassis_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9848/files/zebexabopo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/deferred_annuity_sample_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/87583658324.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/kixojiworasez.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_off00007fbe.bin
1f1047f92a4bbd297a8e7dfbf7d5748b331c5d05fe67f6bd3be245e00c58bec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBE 5268 bytes
font_01_sfnt_off00009192.bin
263b2fcfdbe45564c3aea6dedc4df671c12b177f37f5343c27a2f2ba884665b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9192 10172 bytes

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