Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e52cfa8cc608f32…

MALICIOUS

PDF

44.5 KB Created: 2020-08-05 15:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c453e77a5ae84aa3ab7c7e54f46ae3 SHA-1: 88211cb7a2ebc7b128245c6123820022a453bd9f SHA-256: 7e52cfa8cc608f32103d6bfba7562ab259c655bfe22bb14f1032608b9ba34f5f
150 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.cc/pify?keyword=medium+access+control+sublayer+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=medium+access+control+sublayer+pdf
    • http://files.nikkilmoore.com/uploads/1/3/0/8/130873921/c31fb860094.pdf
    • http://files.iriediner2go.com/uploads/1/3/2/6/132695694/619c08a21735d5.pdf
    • http://files.common-ground-communication.org/uploads/1/3/0/7/130740458/b1fc3f5c7abf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/48759571808.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/amelia_bedelia_first_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/0925/2250/files/49067168551.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/jalozuduxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/sevegikuxukurejeritadefek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/volalozuwatasivip.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/marujavarawetofak.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/wofanizibozuxut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/fapaxolak.pdf
    • https://cdn.shopify.com/s/files/1/0437/2407/9254/files/panosonic_fax_machines.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/38686376690.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/64062179085.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/57937081672.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/lunobidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/kumowibemejit.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_off00006f65.bin
a6a84a6351846eabf415a3ab260b62e7609329f8d0344c9af9e66d254a248074
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F65 5548 bytes
font_01_sfnt_off00008233.bin
28deb7d473b301d3c67c3e8d6386a326bf7fc0b28fb488e798a954b88f8f1740
pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 10112 bytes