Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3562d52b7f24ad…

MALICIOUS

PDF

52.1 KB Created: 2020-08-02 16:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d61f05b5a57ae9e44b23da5e701097 SHA-1: b70170f862316d58d99f0d773a1e9a771a9fdb7f SHA-256: 4d3562d52b7f24ade8067b7bd894eee1050ed1ad0db640c2d1463e463ccbd0f9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to obscure the true destination or to engage in SEO manipulation for malicious purposes. No scripts were extracted, but the PDF structure and link analysis are sufficient for a high-confidence assessment.

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=unity+break+prefab
    • http://files.springdalesva.com/uploads/1/3/1/4/131438142/1456653.pdf
    • http://files.awuahlab.com/uploads/1/3/1/4/131407492/tazatoxomuni_resefit_sesebumuwodade_zemetaxis.pdf
    • http://files.lathamhomesanitation.com/uploads/1/3/1/4/131407148/6056627.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/peanuts_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/12098574620.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/67036673948.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/xurofurufafil.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/noxewezididixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/47152288575.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/3265682087.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9907/files/wekire.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/riwus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/72786691917.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/21811377767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/sovedimun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/9347901621.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/66194308829.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/kendrick_lamar_damn_torrent.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_off00008f50.bin
f51584b6d475948fab869b88aeff221fbd8824b3352afe884dfefab7f82c463b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F50 4980 bytes
font_01_sfnt_off0000a062.bin
6e9a438f167d17ce87848696d01cc936070225a1a3a38b5c67c58833aeccbac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA062 10176 bytes

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