Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcff7d07a16a8a65…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 15:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320bdbb06d0fa8cb5ffe35453d5d82ff SHA-1: bb19156bb1097300556a7ce5cead48127af5d20f SHA-256: bcff7d07a16a8a657d7ea85f4d14d37d66203a44ae97604a270d565e660d6da6
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to Shopify domains, suggesting a potential SEO manipulation or link-building scheme. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.com`. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and a reference to 'Bethesda.net mods', which may be a lure.

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.com/pify?keyword=bethesda.+net+mods+wont
    • http://files.christevangel.org/uploads/1/3/1/0/131070560/d279b0a0e301.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/68649716550.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/xujedaxadorubadef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/14127941439.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8257/files/leforebivokukoduzomede.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/etymology_of_religion.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/memutonevizesofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0859/7927/files/fallout_4_ammo_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9045/files/65712214873.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/arabic_to_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/gosofasukifa.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_off00005283.bin
7c08ea49fc0a32df19b434edd11d90f5ed3e317a85db4a2c65992c2c724764f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5283 4852 bytes
font_01_sfnt_off000062e5.bin
b5e34cde953827059e5b037e1b3a8aa0a337f75872ec3d5b343bb4552ac8a2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E5 10080 bytes
font_02_sfnt_off00008567.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8567 4324 bytes