Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb36d839cec0f6de…

MALICIOUS

PDF

51.2 KB Created: 2020-08-07 17:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4cefc8551e78994575e1918f8c05e5c SHA-1: 7b46191ecc9108d9f1f30710c6d8b6ff14253c3f SHA-256: bb36d839cec0f6decbbba2ff9ef274d5ee2c6a4a56d2d5b882870d2f75272504
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as information about 'wilms tumor treatment'. The document body itself is heavily obfuscated but contains the same lure text and URLs. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the primary attack vector appears to be directing the user to malicious infrastructure via the embedded link.

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=wilms+tumor+treatment+pdf
    • http://files.plainsedgechiropractic.com/uploads/1/3/2/6/132683140/bipejomolujivesobo.pdf
    • http://files.peoriahomethaimassage.com/uploads/1/3/1/4/131406202/844f238ce.pdf
    • http://tuger.theyogaterminal.co.uk/uploads/1/3/1/1/131164312/2020197.pdf
    • http://ranajeja.plan-my-trip.eu/uploads/1/3/0/7/130776760/a5d676a.pdf
    • http://files.sweetbstoggs.com/uploads/1/3/0/7/130775025/43a6f.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/25954506588.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/castrol_magnatec_10w40_diesel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/26761903214.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/39490790042.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/bpmn_notation.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/2020_odia_calendar_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/37181510110.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/68352459792.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/40295842569.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/lua_switch_statement.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/39969761564.pdf
    • https://cdn.shopify.com/s/files/1/0438/1379/8050/files/application_architecture_books.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_off00008aa0.bin
fa204f7691c23a4c863ac74f7472f695a7b41745e45beb9f90d16d25c482513b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA0 5200 bytes
font_01_sfnt_off00009c42.bin
dca3c28ae93bc8fd69d9273b5d17a7bf88b06818aeb1d4acb8bee20091141d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C42 10456 bytes

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