Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bef652045dbd0…

MALICIOUS

PDF

37.8 KB Created: 2020-08-22 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1cfa130ea3f461f48df8a2a1d93ee6 SHA-1: 54d6c89cb932deaba5918cb5b0e0e01b0df84666 SHA-256: 826bef652045dbd0b92607f89955434b281246b70c31e50d23e7c2a5bf73d0a8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a user manual. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs hosted on various domains. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this 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.cc/pify?keyword=bernina+700d+overlocker+user+manual
    • http://files.cam-efi.com/uploads/1/3/1/8/131856160/rolowavenonizawifulu.pdf
    • http://files.keyadigital.com/uploads/1/3/1/3/131379111/wirupejav.pdf
    • http://lepeporo.urbanedenbeauty.co.uk/uploads/1/3/1/4/131413418/5711969.pdf
    • http://vidunesu.joelmiddleton.com/uploads/1/3/1/4/131438563/zenunusopojumevir.pdf
    • http://radize.designauthentic.com/uploads/1/3/1/6/131636612/9ae4548b9.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/23749920150.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/83234844424.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/jifaparunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8418/files/top_self_help_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/78998119742.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/t_fal_actifry_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3157/files/35535650233.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6665/files/oba_rowland_lifestyle.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/94878212840.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_off000055c8.bin
d0ad374afb6a05f7ec33244967c577fe4b277b165336b918d3d04bbc120cbb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C8 5480 bytes
font_01_sfnt_off00006859.bin
68f3c32476f42e9d93e6e1eb0529e578935eeed47dd0f2dc9408a60be29d20c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6859 9976 bytes