Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e988122593ec25…

MALICIOUS

PDF

57.3 KB Created: 2020-08-24 06:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee20de9449ff5d8c585d59b46921a730 SHA-1: 7ce0d1fd68e98135a0530bff063f02265134f0cb SHA-256: f7e988122593ec2599aa3572243de35d7313a206c0b7d2bbed74cfdb43cdf1b9
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final destination of the malicious payload. The presence of a large link farm further suggests a campaign aimed at driving traffic to potentially harmful sites.

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=android+automotive+volvo
    • http://vijufa.autismhomebase.com/uploads/1/3/1/8/131858419/zudubodug.pdf
    • http://files.westernhsmusic.com/uploads/1/3/1/4/131437295/5367497.pdf
    • http://files.patanjali-yoga.info/uploads/1/3/2/6/132683165/fakanufipixebosu.pdf
    • http://files.vrmotorsport.co.uk/uploads/1/3/0/7/130740573/6789865.pdf
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/29458383488.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/bikini_bottom_genetics_review_answer_key_2003.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/nabuzimenigetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/60709391500.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/complete_champion_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/90115708361.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/16221782648.pdf
    • https://cdn.shopify.com/s/files/1/0437/1064/4377/files/abacus_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/jinedotugalikomibobapite.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/94268211947.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_off000097fc.bin
3a9d2696d6f99f7fd855dc28cba9a39d1af8492bc7ff1319217e2a163ea14b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x97FC 4844 bytes
font_01_sfnt_off0000a859.bin
bac404cfb159844944e768dfaf5f015370a492624288ee2b120ac48787a9df10
pdf-font-stream PDF embedded font (sfnt) at offset 0xA859 15548 bytes