Malicious PDF — malware analysis report

Static analysis result for SHA-256 799483652b8697f4…

MALICIOUS

PDF

41.5 KB Created: 2020-08-17 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215a3f47f657f6441483eb0b433cb93c SHA-1: 56d810429fbf2c2e1d129c5609245b8440561513 SHA-256: 799483652b8697f42174160e6b4f3af712317e8df842a49c12b90c4eecfff17e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'free font'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or traffic. The ML classifier also strongly indicated maliciousness.

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=canterbury+free+font
    • http://files.karenepoirier.com/uploads/1/3/0/8/130814043/goxojodotiwanaraz.pdf
    • http://pejuka.radicalphilosophyassociation.org/uploads/1/3/1/8/131871655/5312948.pdf
    • http://files.reikibysharon.com/uploads/1/3/1/4/131437956/3ca9ab94b14c64.pdf
    • http://files.instantcarappraisal.com/uploads/1/3/0/9/130969744/ed16ae8a8f253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/senerega.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/87760591118.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/26691052765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/weredokajikavepisidasoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/tokiden.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/property_development_business_plan_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/fukakata.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/xojidijo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/tudexomaluvexufitaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/pelasadapijomavugo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005334.bin
a67776e49ccf6494d0a2b6bf06c0975ddabfdadde29026e7906b845ef5a3e2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5334 4700 bytes
font_01_sfnt_off00006343.bin
84b94c6cc101a1e5adb81324c5d6c95ea2925a79dfcffedcc7da28c81bc491f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 3420 bytes
font_02_sfnt_off000070fc.bin
0bb2e79732e3cc64c04d38c98b80c986381e8dc2fd217de75a6a5f53ff50ae92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 11924 bytes

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