Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b9c95cb0bc3c5b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 06:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9164acdd2dea760d764e5c79a7b71a2 SHA-1: 507a662016f048fbd5716f40359496a4a69de6b0 SHA-256: d1b9c95cb0bc3c5b132156ad6e9559f9d705506e930ba7e7c63e8be88bf451d4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to '2019 calendar 2020 printable free pdf' and includes the malicious URL https://ttraff.cc/wb?keyword=2019%20calendar%202020%20printable%20free%20pdf. The presence of a mass external PDF link farm, with many links pointing to Shopify domains, further supports the SEO-based lure tactic. The ML classifier also strongly indicated 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.cc/wb?keyword=2019%20calendar%202020%20printable%20free%20pdf
    • http://files.microbladingbyz.com/uploads/1/3/1/0/131070152/luribapewinozuda.pdf
    • http://tafeje.m3dengineeringsolutions.com/uploads/1/3/1/3/131383647/1567497.pdf
    • http://files.trailtothepeople.com/uploads/1/3/0/7/130739043/bavupurope-kosagafavujirub-lagaximutal.pdf
    • http://files.beckytiernan.com/uploads/1/3/2/6/132681342/8354347.pdf
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/strength_of_materials_by_rk_rajput_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mabiwabupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/85920902786.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/subtracting_unlike_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/6910/2485/files/arabic_characters_are_disjointed.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/duzimikivesitasuperaras.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/24725369732.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/61510942353.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/32722823560.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/breath_of_the_wild_stalnox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/gudugovifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1815/7221/files/piano_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/insomnia_symptom_questionnaire.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_off000064f9.bin
876f3fb24536d4233b863d7c32cab0f88eb8a05c8efd12c9daa531a7b51c27b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 5496 bytes
font_01_sfnt_off000077a4.bin
952250ed15b7cef6524c0dac212b4aa134d24cd7bd0008d72de4fe8d1a02f1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 10844 bytes

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