Malicious PDF — malware analysis report

Static analysis result for SHA-256 797d594b9e5e6c3e…

MALICIOUS

PDF

49.5 KB Created: 2020-07-30 15:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc04b08f6e21e22a02e08c989d9e9c79 SHA-1: 48438d40f3d88c8580e4b9ccc06fa45325dc2975 SHA-256: 797d594b9e5e6c3e2dbde3fe30418f8c1502ea2ac1703c79addaedd6db3179c3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm, with numerous links pointing to Shopify domains, likely to obscure the malicious intent and improve search engine ranking. The document body, though heavily obfuscated, suggests a lure related to 'black swan psychological analysis'. 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.com/pify?keyword=black+swan+psychological+analysis+pdf
    • http://files.kathysnow.ca/uploads/1/3/0/9/130969254/7718378.pdf
    • http://files.londonputtingacademy.com/uploads/1/3/1/1/131164273/8818552.pdf
    • http://files.nt-307.com/uploads/1/3/2/3/132302892/dac89e7ce2184ad.pdf
    • http://files.winfieldepiscopal.com/uploads/1/3/1/6/131606360/2957768.pdf
    • http://files.jujuic.com/uploads/1/3/1/8/131871597/9f8d6b6c1.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/37301100177.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9274/files/gurufadovalasiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/mudidiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/fipob.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/muwefovoxobum.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/porexijuguzilopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/31056983952.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/kiwatetejunubago.pdf
    • https://cdn.shopify.com/s/files/1/0429/4567/5420/files/jetukolelopura.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6411/files/ridepukisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/72172344947.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/sekud.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/63575930923.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_off00008555.bin
efcd517e943abf593c7ad2c39f2cc1fdb97947e0b8b5461b7f2d0a6e77a7448f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8555 5220 bytes
font_01_sfnt_off0000971d.bin
4d6ec174ebf8ec186550ebc8fed4425b095982f809ef07251ca49b60785d6712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971D 9804 bytes

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