Malicious PDF — malware analysis report

Static analysis result for SHA-256 859ceb16610a9051…

MALICIOUS

PDF

55.7 KB Created: 2020-08-05 23:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb022b1e64cf13658077d16dc597b5ad SHA-1: ea5840afd13ea43fb5aba1a898d8bb16054ddde6 SHA-256: 859ceb16610a9051fe9133fd2ce63a2727af0b0bef09fc97c570b3c7ab291c4a
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting a lure to external malicious content. The presence of numerous links, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate malicious destination.

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=defensa+siciliana+dragon+acelerado+pdf
    • http://files.manchesterlandscapingct.com/uploads/1/3/2/7/132740900/lurogoxumegupubifol.pdf
    • http://files.codeelectricmqt.com/uploads/1/3/1/4/131437948/7edf5f5834f64.pdf
    • http://files.achswritersweek.com/uploads/1/3/0/7/130776206/tawujof-pufoko-witig.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/basecamp_garmin_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/pujunuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/deviwevut.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/bland_diet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/69246566058.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/lamebisixu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3011/files/mob_spawn_distance.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0157/files/72741320078.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/32079565144.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/2008_dinghy_towing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/78932499058.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/99033292175.pdf
    • https://cdn.shopify.com/s/files/1/0448/3517/6608/files/electric_car_industry_analysis.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_off0000953f.bin
6349cba5d3cd0a24baeeebfbba941994e17d396e9285198e97e7097daa66cf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953F 5320 bytes
font_01_sfnt_off0000a770.bin
900b99aeefd4d87d3f0da3b166937a9b8a6212a73bda37ec3265bf44a8c22516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA770 13436 bytes

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