Malicious PDF — malware analysis report

Static analysis result for SHA-256 b847dff0018a1796…

MALICIOUS

PDF

66.5 KB Created: 2020-07-28 06:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b22580efb8bd6eaaf719987a3d1303 SHA-1: 6098dd02b80bb8825cbe26c8cafeebd5881708a2 SHA-256: b847dff0018a1796d2fdfc41288de4509bed5be822f92519e17b2e8f0d93d40d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.cc, which is used to redirect users to other potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO link farms. The presence of a large number of external PDF links, many hosted on Shopify, further supports the link farm hypothesis, likely intended to manipulate search engine rankings or distribute malware.

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=product+landing+page+template+wordpress
    • http://files.donaldshoney.com/uploads/1/3/1/6/131636946/dekiliwu.pdf
    • http://files.but10nscreations.com/uploads/1/3/1/6/131636988/6869826.pdf
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdf
    • http://files.valleeview.com/uploads/1/3/1/8/131872105/zotofipiludopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/sotokedigefere.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/64711857178.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/xusaxesuvenusitizufekub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/61763657278.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/wokexuzunulet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/tetuvakupavewesitawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7445/files/genozukem.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/93710251688.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_off0000c83c.bin
16f79aeb70acbc903e2c01af55504ef6c1082a04569792bfda307dd97d3eb444
pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 5368 bytes
font_01_sfnt_off0000da6d.bin
a0512a4328f03272e844cae3066581cf99c9abb4134d1c48c1e486e23c17f222
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 9996 bytes