Malicious PDF — malware analysis report

Static analysis result for SHA-256 38de34fc6c5020f1…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 08:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103e962cbe49d2927341f4c4624ba5c1 SHA-1: f51479224e3a7b143bc06b08c0c9cccaf9d8c4e9 SHA-256: 38de34fc6c5020f11270c9d89f77474a6a7f5c046dc51d1247beccec9d6e370a
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO and distribute the malicious content. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=first+angle+and+third+angle+projection+difference+pdf
    • http://files.smartfirstaidcprtraining.com/uploads/1/3/1/3/131379266/2267213.pdf
    • http://files.silvaweb.net/uploads/1/3/0/8/130814132/xitowimap.pdf
    • http://zijiru.blueridgestitches.com/uploads/1/3/1/4/131453494/3f736972.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/27048324408.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9074/files/partnership_agreement_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/65713534490.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/pdf_file_combiner_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/guitar_chords_book_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/euclidean_distance_formula.pdf
    • https://cdn.shopify.com/s/files/1/0437/2240/8087/files/din_en_iso_527.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/3_letter_airport_codes_usa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/allegory_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/zaponajuzonite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ketotojugidumirazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/74843990488.pdf
    • https://cdn.shopify.com/s/files/1/0437/6585/8455/files/geometric_distribution_proof.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ff.bin
0a93f401c3434dd76017c52af8c98700b742a6eb908ce784b55cef3f8962636d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FF 5448 bytes
font_01_sfnt_off0000748d.bin
e45d25c2422acaed90c15648d202c053299605f0af47ed19db723e6c3414c54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748D 10060 bytes

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