Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a373f88c7949559…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 12:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b90102df5f5e46998d5056091fc2c8 SHA-1: 2982e40cc036a957081ee427c0dfcdec65dab584 SHA-256: 4a373f88c79495591aff2f9696ad0b38ca4c6c3f46e2f2f2e9c19f80b51144f9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=america%2527+s+got+talent+magic+videos'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0429/1392/3228/files/carbon_fixation_in_photosynthesis.pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious redirectors and link farming suggests a phishing or content-luring attempt.

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=america%2527+s+got+talent+magic+videos
    • http://files.campbellbarnescounselling.com/uploads/1/3/0/8/130813526/3c8b0076.pdf
    • http://vizadeb.dhsfalconize.com/uploads/1/3/1/6/131637814/bevivamen.pdf
    • http://files.mistresskami.com/uploads/1/3/1/3/131398171/8145219.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/carbon_fixation_in_photosynthesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/fejonikifegimilajexasure.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/why_did_you_choose_accounting_career_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/conquering_carpal_tunnel_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0438/3634/2434/files/29519367893.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/85474580348.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/pusufopasunonavilil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/kudafatulowili.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/7919988429.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/wigekesib.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/48713110603.pdf
    • https://cdn.shopify.com/s/files/1/0461/5421/9683/files/hackintosh_build_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6326/files/59816157414.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/nujejogofulejegulanawidid.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_off00005df6.bin
8875be5a33cead05d4734f558ddfca86a8b20a92b81e05700efef21586be0daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5344 bytes
font_01_sfnt_off00007009.bin
9d838fbc5d73ac65f9d1aa1750ac3b7e7eb3860defa7dc837c16f0f0d4c37e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10360 bytes

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