Malicious PDF — malware analysis report

Static analysis result for SHA-256 f903ab7759bc49fe…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57bc3a5ef28958ac979712ecce1030c SHA-1: 2ca074a978cbac76e54d2b2381d576314a7acd36 SHA-256: f903ab7759bc49fefca105322fb7bdb40a1ac512a8914b50fb991a74b455b7b7
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 identified as a known malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to direct users to external, potentially malicious, resources. 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.ru/pify?keyword=different+forms+of+communication+worksheet
    • http://files.miguel-castro.com/uploads/1/3/1/6/131606343/d3b8effd00.pdf
    • http://files.karnseverson.com/uploads/1/3/0/8/130874064/wefumez.pdf
    • http://lotesolu.kira-marie-mccullough.com/uploads/1/3/1/0/131070872/d47232fa8a8.pdf
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/rimesenulom.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/dapebawajidevavedozinujum.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/lichen_amyloidosis.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/70540360105.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/bezexevuzaxokewuduwiki.pdf
    • https://cdn.shopify.com/s/files/1/0457/3397/0086/files/dragon_naturally_speaking_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/puroge.pdf
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/dj_dance_video_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/diploid_vs_haploid_chromosomes_worksheet_answers.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_off00005d53.bin
ed6673b38bce85f9ef2b01bd3e1c5ca098909197920b818d268c137d68f7e679
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 5244 bytes
font_01_sfnt_off00006f19.bin
5cb011803fd8048b7b330d677254314f1f3ce2da442fb6c82070857bced95513
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 10296 bytes