Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47b7fbb2feebee3…

MALICIOUS

PDF

57.2 KB Created: 2020-08-24 00:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a83e0311d2ab05fbbb23b59412b78f SHA-1: 5c44e6ddbd2a99709b60738775de5e30aa569832 SHA-256: a47b7fbb2feebee3d34327a366da36c87b582a26c754486d6380f60dcdb6f054
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Homefront 2 game guide' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=homefront+2+game+guide
    • http://doduvaneb.owencountyfair.com/uploads/1/3/1/6/131636612/pifedas_nimod.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/mumumij.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/cagliari_mappa_turistica.pdf
    • https://cdn.shopify.com/s/files/1/0450/0904/3606/files/classic_car_appraisal_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/additive_manufacturing_gibson.pdf
    • https://cdn.shopify.com/s/files/1/0432/3809/7051/files/hybridization_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/basemiboxekabudugiziva.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/bebufadajapuzabimo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/kekelidozokupitova.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009665.bin
6de834171014a0076755d6a1f0607afe710fa54d49b0afbfc0e1aea1f220abac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9665 4992 bytes
font_01_sfnt_off0000a740.bin
d4060f738c9c388c4db6423afb6ca0685cb579c5c488192d9682c39c98bb65e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA740 10264 bytes
font_02_sfnt_off0000ca6d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 4324 bytes

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