Malicious PDF — malware analysis report

Static analysis result for SHA-256 4392fb9c529b1dd0…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 01:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a78e88a40703258dc6c7d3043138d8 SHA-1: 78b189c7bf57ae3df4a3d9f1b025db9a301e5ecc SHA-256: 4392fb9c529b1dd0f081b83577c9417a894c8356dd6ceaabc691591dbb49acc5
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified as 'https://ttraff.cc/pify?keyword=definitions+of+leadership+pdf', which is designed to lead users to potentially harmful content. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier strongly indicated 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.cc/pify?keyword=definitions+of+leadership+pdf
    • http://files.tesoltime.com/uploads/1/3/1/6/131606348/mefede-sebawalusi-nenesemozided.pdf
    • http://files.friendsofpns.org/uploads/1/3/1/4/131455337/b0581.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/39429365707.pdf
    • https://cdn.shopify.com/s/files/1/0447/9369/2326/files/blockchain_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/20038683920.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/hannah_arendt_eichmann_in_jerusalem_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/1778/1927/files/abdc_season_8_episode_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonub.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/tiduj.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_off00005c76.bin
90b1e2dd6a7bc4bf3a95bde1a8a1bad17dfbb542e59176d208995a9f095a32a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 5128 bytes
font_01_sfnt_off00006dde.bin
c7da7ce9737518d8e96d0c1e9fe2aef2bff91f69a4ff2f610882b32e1ebae722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDE 9872 bytes

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