Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2d8c6ea16ef349…

MALICIOUS

PDF

38.2 KB Created: 2020-08-15 07:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9751e2bf6ae242d1de79ae17ae9b8d75 SHA-1: f7a5b5c60eda0db75b2bc58a94903966fb882858 SHA-256: 0e2d8c6ea16ef3493d2a6eb4902a855979083659b70e2d64ff152a37f739e475
154 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=basic+english+skills+test+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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.cc/pify?keyword=basic+english+skills+test+pdf
    • http://files.sharonviewcorpcenter.com/uploads/1/3/2/7/132710765/0475cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0339/1645/files/bohemian_rhapsody_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/zurakegunilafesin.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/coller_2_fichiers_ensemble.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/97639500029.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/42267010947.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/10903964037.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/17474107935.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/16558305627.pdf
    • https://cdn.shopify.com/s/files/1/0438/5865/7430/files/stamford_alternator_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/gopirilebisiwepep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/bihar_police_si_exam_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/10166438354.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005595.bin
39ca5da700e641c5c7e53f54645f0c21bdaab0d166e4e07255b15c86c1064eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5595 5436 bytes
font_01_sfnt_off00006804.bin
500f73f98a0e068cfb9a92cedc2fbd6f57771c050131e07fdc70f41437d67bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 10652 bytes

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