Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5090284dc00a2fb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-24 19:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ebb6938b5249774b7352f7722271df8 SHA-1: f7e3da3a962e0f1a6b041d22e3a59cc5b70e1027 SHA-256: a5090284dc00a2fb46e6fba8c7c601be76218fb45f1b8fcdab8401b0a47c962b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify. The primary attack vector appears to be social engineering, using a deceptive title to entice users to click the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=dark+web+imdb+parents+guide
    • http://files.kxela.com/uploads/1/3/1/6/131607103/ebed7970b89.pdf
    • http://files.virginiaeasterday.com/uploads/1/3/1/4/131437074/336df7023809.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3061/files/arquitectura_de_computadoras_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/cervicofacial_necrotizing_fasciitis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/14833469847.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/97542386394.pdf
    • https://cdn.shopify.com/s/files/1/0436/7246/9669/files/47654226186.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/saroxebubosebiganedilori.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/perubetojevelideluj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/mitiwewowovikawumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5233/5255/files/fudewarif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8885/5718/files/3610956047.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/bet9ja_mobile_app_for_android.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_off00005d1a.bin
d344ea133ae09bff260a8621accd7d8a059fba3615d5e99e09a5f95d4681130b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 5316 bytes
font_01_sfnt_off00006f25.bin
f00603561503b4205888c5e083e942ab006c0489969bb42fd3d451baf3d3eeb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F25 9972 bytes
font_02_sfnt_off00009133.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9133 4324 bytes