Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61b1a629c0d2d0d…

MALICIOUS

PDF

37.9 KB Created: 2020-08-02 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f6a6b6984a7aaa31069fd1067cba9b SHA-1: e1f3cf869834a4d59ae94c39a087c3b88320a940 SHA-256: e61b1a629c0d2d0dbe24b0e4eba90ffd8e7aca0dee3e52bfabd38a23602fa958
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning model and heuristics indicating malicious redirection and a link farm. It contains numerous embedded links, with one pointing to the known malicious domain 'ttraff.com'. The document body appears to be obfuscated or malformed, but the presence of the malicious redirector and the sheer volume of links suggest an attempt to lure users to malicious content or facilitate further infection.

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=grep+for+multiple+strings
    • http://files.maritimeheritagepress.com/uploads/1/3/2/6/132681295/3021846.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/8/130874492/6657802.pdf
    • http://files.historywithmrprice.com/uploads/1/3/2/8/132815298/pesuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/xojubob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/rasamupitilewedor.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/13026727107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/feligarobunisenolusiva.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/9714209088.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/73822935150.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/mojumujumujulajafodi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/66092187479.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/88387549658.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/30962514966.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_off00005751.bin
f5d87ad8df2e676b6d07831ecaed74366bfd83389983c58658c5db6170f26e05
pdf-font-stream PDF embedded font (sfnt) at offset 0x5751 5040 bytes
font_01_sfnt_off0000686c.bin
d8c9479cca7ed8c42a8e8c93330680a372b759cb3d9b9ebc6419060e0e74de7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x686C 10160 bytes