Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ffdae4014b22f9…

MALICIOUS

PDF

53.3 KB Created: 2020-08-23 18:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b17852c3d0d0a73366e658380dc6678 SHA-1: 640f7fadf52b0de0aa285d8e9992ac70391f9eb2 SHA-256: e1ffdae4014b22f96edb8f96fc09c27b2353d08a2df1118b1315300aafa02d38
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, with numerous embedded links pointing to various shopify domains and other unknown hosts. This suggests the primary purpose is to lure users to malicious sites.

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=malayalam+bible+funny+questions+and+answers
    • http://kebufiti.sunnytreehouse.com/uploads/1/3/1/3/131398027/xerasosudadib-nafobopibo-giwisuzebumu-kuluwadob.pdf
    • http://files.realestatestuff.net/uploads/1/3/0/7/130739918/f4decbb3.pdf
    • http://mupox.tjcsga.org/uploads/1/3/1/4/131452923/5f1412a7f309f5.pdf
    • http://files.fernandojimenezphoto.com/uploads/1/3/0/7/130775868/tezafovibebami.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/sense8_christmas_special_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/best_video_editor_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/34126907597.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/fozuresa.pdf
    • https://cdn.shopify.com/s/files/1/0465/0473/8966/files/1910317212.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/58170819360.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/ritagezamuveletagivofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/21058187868.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/lifewegafipidigol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/chemical_and_catalytic_reaction_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/gituv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4095/4773/files/98954137723.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/10784810412.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_off00009170.bin
fce18546806ae485f4cdde9ba8850366f7a9f942b2837526f47dfdf3e39f5558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9170 5516 bytes
font_01_sfnt_off0000a430.bin
37a061855c6e4c8e902c8b56087ca38891a5d28e1f00572d676b2a9732441cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA430 10404 bytes

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