Malicious PDF — malware analysis report

Static analysis result for SHA-256 af610f33f9bce1c4…

MALICIOUS

PDF

49.3 KB Created: 2020-08-04 20:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d098ca25cde0ec2579b2782c08b71f9b SHA-1: 0bb586227d08ba4b1a0c0f44334dfc6b5827a0ca SHA-256: af610f33f9bce1c47e601b7f0cad3119352d0221412d4dcd1f4f06155163b374
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=english+club+grammar+pdf', which is also flagged as a malicious redirector. The sample also includes numerous links to Shopify-hosted PDFs, suggesting a link farm or SEO spam campaign designed to drive traffic.

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=english+club+grammar+pdf
    • http://files.tutshillpreschool.org/uploads/1/3/2/7/132710797/52e80f99a6bc36.pdf
    • http://files.gusandrubys.com/uploads/1/3/1/1/131164350/powoxavupawewo-fafedereberem-rubopokidijapuj-gozututuwurud.pdf
    • http://files.torrentengine18.org/uploads/1/3/1/4/131483371/5465793.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/missile_war_minecraft_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/vidifesasijotawukiwisak.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/22354412704.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/pigamofasur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/hp_elitebook_8470p_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/voriguzelex.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/weight_watcher_sample_menus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/96570469467.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/lemonisosutujafijomiwara.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/bl2_reborn_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/74707391501.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/68244509888.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_off00007094.bin
ef4dcd49d5dbc62571c9b8cfcc5a9ffdc31c3637761e8f90254adf32e5c1c07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 5668 bytes
font_01_sfnt_off000083ae.bin
3efbcc98d5d8f91bb25fe4020cb2d4ca7a341e1879c01ed679d939719637efc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AE 2312 bytes
font_02_sfnt_off00008dfd.bin
e86a3297699026eaf4d82f71f9d46f11d402d5b9d8c6b6c90f5495240584fee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFD 13408 bytes

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