Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a223c2c9cbabb65…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 06:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28619b7f2a23d83e85fbdf498cf61ac0 SHA-1: ea9d4e051379170949f0d814e25fee6203cf5495 SHA-256: 8a223c2c9cbabb65f9588dcc6105a9b36b5d1399df57f5f0089542094ef01c59
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a download for 'gta san andreas vip mod 3'. This link directs to a malicious redirector, ttraff.cc, which is flagged by heuristics. The document also contains a large number of embedded links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicates 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/wix?keyword=download+gta+san+andreas+vip+mod+3
    • https://static.usrfiles.com/ugd/1f2646_8abc7a3cc5a642f0ab6fa33ce7433b42.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1d2c020d34c41ef80471d436125ba5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d70c5c6f37024ce0901cfea14c0efcb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ae12a515684e9cbe0ba16862820ffa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d135705168cd4abcae0b1b26b3c28bfb.pdf
    • https://cdn.shopify.com/s/files/1/0438/6550/5952/files/anestesia_regional_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/wow_arcane_mage_top_trinkets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/fundamentals_of_database_systems_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/chemistry_raymond_chang_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/jitukivujisike.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/84904593431.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/roxosipoxotoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/17208712991.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa5.bin
d22bde53ed61f2444d457965047afe38fb9158b74fd0b58a766dcc45ad054f64
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA5 5592 bytes
font_01_sfnt_off00005db3.bin
ec54bf642bcdace9feef5159fc36cd1f48cadf056d20a0653bb3060bac5ad965
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB3 9852 bytes