Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa71d36a476d2b9…

MALICIOUS

PDF

46.8 KB Created: 2020-08-22 04:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3a5d7f88ef6d12f8d0f23b147d7519 SHA-1: 6cf7541686c2c49b104343b02319a95211979aab SHA-256: 1fa71d36a476d2b970647a9161befd7676372077fdc39214247ee001999c6bc7
154 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 pointing to Shopify domains hosting other PDFs, which is characteristic of a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated but contains the same malicious URL, reinforcing the attack vector.

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=present+ministers+of+karnataka+pdf
    • http://files.aliciamerrett.co.uk/uploads/1/3/1/4/131453651/1088053.pdf
    • http://fevavet.myprojectindia.org/uploads/1/3/0/9/130969504/jimez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/consumer_reports_best_home_air_purifiers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/architecture_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/android_photo_recovery_software_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/kugazimoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/kindle_fire_hd_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/vadekataloboxulaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/915974737.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9946/files/buxofenuzokobino.pdf
    • https://cdn.shopify.com/s/files/1/0437/9780/7265/files/21879295871.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_off0000650c.bin
f4d02b209fa75cb106d9bf9c1edd4300eea56daf82c6376e0a2d7d9ceca0b71a
pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 5220 bytes
font_01_sfnt_off000076b3.bin
1dd82f8d4bfc0ab3c9fdfb78572f89cb711edd0dbc05895db1b9b98096c226f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 10080 bytes
font_02_sfnt_off0000997b.bin
1b1879b81aac0f72292e828c3fe872ecfa6f91c99efa97587eaba408d4a9007c
pdf-font-stream PDF embedded font (sfnt) at offset 0x997B 5892 bytes