Malicious PDF — malware analysis report

Static analysis result for SHA-256 a524cb0b4225b8b3…

MALICIOUS

PDF

46.8 KB Created: 2020-08-02 09:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98c8cc35be3c467901eb5c236750b86 SHA-1: ea4ffa7b2e51bedcbdb29e41aed101569c771a4f SHA-256: a524cb0b4225b8b352b487b24060b8a51227a4a0857359bc488de041ddd4e7a9
140 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body also contains text consistent with a callback phishing lure, asking the user to call a phone number in a billing or refund context. No scripts were extracted from this sample.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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.ru/pify?keyword=oceanography+an+invitation+to+marine+science+pdf
    • http://files.kimberlysfarmflowers.com/uploads/1/3/2/6/132695194/guzuv-negubosoj-simurelo-femalubifo.pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.malouky.com/uploads/1/3/1/3/131384797/vovebef-bubozexud-bavenoviwan-nenilaratam.pdf
    • http://files.livestockmanagementsystems.co.uk/uploads/1/3/1/3/131384256/tazemexabizexu.pdf
    • http://files.colindecio.com/uploads/1/3/2/6/132680855/kotagamajexiniv_tafidenasuvan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/torogapegipilotajo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/lapudumujeji.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/56674712992.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/78885114863.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/1670192789.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/amazon_echo_error_registration_failure.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/71666813641.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/82828655682.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/jopozox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/lodenosizadusakixipukop.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_off000076b3.bin
5a5f45652a049c8e6ff5625a2a251c66f1120513ec706feb7ba161b1553efb0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 5728 bytes
font_01_sfnt_off00008a17.bin
2cf7462ec9ed069f91f0fdae748873d35c9d4081a5b6d641a131b3a4b7555ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A17 10500 bytes