Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f2e25668631a58…

MALICIOUS

PDF

46.1 KB Created: 2020-08-10 06:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22a4c2f4c1a0259d7cc03abe07b624f3 SHA-1: c65589a572652fd23764eb82c41d3ec22f7023e9 SHA-256: 53f2e25668631a580205c3f917fe2336324ee5d7a8171513983d6d89adac8615
154 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 'ttraff.cc'. This link is presented within the document body, suggesting a social engineering lure. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing the user to a malicious URL disguised as a document download.

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=infrastructure+as+code+cookbook+pdf
    • http://files.punabears.com/uploads/1/3/2/6/132682802/e4308516cc1.pdf
    • http://files.reisebazar.ch/uploads/1/3/0/7/130739174/8f58e.pdf
    • http://wunufa.maoriworks.com/uploads/1/3/1/6/131606289/naregikolafa_pawesori_vorofivu.pdf
    • http://wovexar.agapegeorge.org/uploads/1/3/1/4/131453284/fipejuvepibom.pdf
    • http://files.hummingbirdmedicineboise.com/uploads/1/3/1/4/131437949/nofomibepopetosaxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/bewafogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/fireguwilalelekofixeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/whole_new_world_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/case_446_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/93425966001.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/96179023027.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/madumuledodu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/88535071341.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0559/files/selesemaxoditurigatodesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5571/7271/files/candido_portinari_biografia.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_off0000784e.bin
fe15ee41f50f5897bcb35d11827f2bddda12c9351f5dc5a28cdfb62c114f2a7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 5256 bytes
font_01_sfnt_off00008a3c.bin
f981343eb55218ed7f52b7223ccb221885ba5c5535048cfdb7f0711ca04cdb44
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3C 9620 bytes