Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf22002cac4f20fd…

MALICIOUS

PDF

62.5 KB Created: 2020-08-19 22:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8054c944cab8aa15328ee07281af6d9 SHA-1: 9970f8cdb4cd370c3d7b896ee3607f62f47a8e3e SHA-256: cf22002cac4f20fd72292ab1f1a68e7a01252bb0d3f26128d13ab23ea839b4f5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body contains the redirector URL and several other PDF links, suggesting a lure to external content.

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=transmissible+spongiform+encephalopathies+def
    • http://files.lordsperformancehorses.com/uploads/1/3/0/9/130969489/nuzilenigidab_sekib.pdf
    • http://files.robleggeconsulting.co.uk/uploads/1/3/0/7/130738912/kigeguxa-xedefu.pdf
    • http://files.therusticacrellc.com/uploads/1/3/0/7/130775304/4846230.pdf
    • http://files.bluefernbedandbreakfast.net/uploads/1/3/0/7/130739789/suvusekowadudivifupe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8419/files/kiwike.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/xerubepemegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/resumo_sobre_autismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8131/files/extend_adobe_trial.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/xejogukulagifidodoponemez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/fupeviwarobutigarasaxek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a920.bin
6e243f1de0515a35f1a62e29a752fac5dfb422609f71dea64c30c3e416089024
pdf-font-stream PDF embedded font (sfnt) at offset 0xA920 5448 bytes
font_01_sfnt_off0000bb65.bin
db1a03c7998dcd130508ccb502386869e1b682ddec5a7a7476089b8ecb93b7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 10292 bytes
font_02_sfnt_off0000de9e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 4324 bytes