Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5f43a0cea3eef4…

MALICIOUS

PDF

55.8 KB Created: 2020-08-12 08:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3de104dc37b8d860a02768531eb738 SHA-1: 58b00cab89ede505825cfb4e65f828c2e61b93b8 SHA-256: 6a5f43a0cea3eef423727fee95c25851dcac8ef080c7b978c173cf97ff4f625f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'upsc exam pdf' and the malicious URL, suggesting a lure to a phishing or scam website. The ML classifier strongly flagged this PDF as malicious.

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=about%20upsc%20exam%20pdf
    • http://nofufi.astiquesalon.com/uploads/1/3/1/1/131164250/8772431.pdf
    • http://files.e-learninginteractive.com/uploads/1/3/0/8/130813461/118182.pdf
    • http://files.ptccommunitygardens.org/uploads/1/3/1/4/131437845/xavoza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/beledazuporabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5991/files/laribototikejapod.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/spines_fire_brute_build.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/54484245103.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/23103052322.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/rokopakisibenuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/ge_profile_arctic_refrigerators.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/48980342746.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/lefepepet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/factorio_purple_science.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079fa.bin
56b5e8e547315066713eebdd46199398483d66679e19dee276281850bed9ccb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FA 5100 bytes
font_01_sfnt_off00008b56.bin
941774a7bcfce85e42a6c1066544df159d9b02ef4ca55de0415204c4bc2fb9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B56 10408 bytes
font_02_sfnt_off0000af3f.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3F 16164 bytes
font_03_sfnt_off0000c454.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 4324 bytes

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