Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd66f184d237b54d…

MALICIOUS

PDF

49.0 KB Created: 2020-08-21 06:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0812d935952d937ae7cf7357fc814dad SHA-1: ee2d9607ee27ece6afb8848fe7e62b5e4823155e SHA-256: fd66f184d237b54d9a67683be9e9b40edea473d192084b3f3628b7d54eed1681
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/pify?keyword=asphyxia+in+newborns+pdf`. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, many hosted on `cdn.shopify.com`. The ML classifier strongly supports the malicious verdict.

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=asphyxia+in+newborns+pdf
    • http://files.antonthomasart.com/uploads/1/3/0/8/130814861/5938178.pdf
    • http://gaguxamep.fleurspressed.com/uploads/1/3/2/6/132696067/4703236.pdf
    • http://bunuxu.anncarragher.com/uploads/1/3/1/4/131407164/kasogikow.pdf
    • https://cdn.shopify.com/s/files/1/0440/0267/2798/files/kudipolifevapalil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/18190378663.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/motorola_surfboard_sb6141.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/17291462363.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/mufixik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/bemonc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/22978141792.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/fetuwofedogojolus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/54336943032.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_off000080fc.bin
bc3a1f9063a10a53064840af0f3383532ff32a0201794d4a803a5a91fe149c30
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 5488 bytes
font_01_sfnt_off000093a3.bin
f7416715dabff61deae93351d02e56ba99a83e550d663853536495627176bd5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x93A3 10404 bytes