Malicious PDF — malware analysis report

Static analysis result for SHA-256 345c33c95159e6a6…

MALICIOUS

PDF

37.6 KB Created: 2020-08-20 10:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf3b0a2f047166d76c080e4c3b1847d SHA-1: 70e943c99975e8ab7f2e34660c3585fad375a521 SHA-256: 345c33c95159e6a6c6659135cd63e598c41c4819dddf815165467ad39ad15caa
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body also contains this URL, along with a reference to 'Valiant hearts the great war android apk', suggesting a lure for users to download a game. The PDF also exhibits characteristics of a link farm, with numerous embedded links to Shopify domains, likely for SEO manipulation. The ML classifier strongly indicates 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.ru/pify?keyword=valiant+hearts+the+great+war+android+apk
    • http://files.streetwareaffiliated.com/uploads/1/3/0/9/130969489/1193008.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/67408285059.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/gabopadetebonumak.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/accounting_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0463/5803/6641/files/mefokef.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/novix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/banjara_punjabi_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/vit_b12.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/xizukalumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/delolimasijujukerobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/32047113054.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_off000053e6.bin
09312d683105680096594c8a9d15e486004d7c44279eb8a9e5b0dce433ab9466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E6 5344 bytes
font_01_sfnt_off00006616.bin
eadbe37eb143fb1af1db6b9286c0b5bac07df5422fe555cb478af41f15325122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 10372 bytes

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