Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8e19fcb804d663…

MALICIOUS

PDF

46.3 KB Created: 2020-08-18 15:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db84e35f1cac5591a02f74c667ce8a0e SHA-1: a9cbf54273a0f67316f224300b1691666ccff7ca SHA-256: cc8e19fcb804d6633d292eb2f4f1565f42e7cd030ea6b28b4212ab8dc4190580
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, while heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.ru/pify?keyword=causes+of+water+pollution+in+nigeria+pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/35095697941.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/22141325527.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/47681298513.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/rujofagunejefimaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/683540220.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/fijomasifasefitiji.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/43166487993.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/vugepaxakobidivado.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8946/files/xawutug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/lisaxapisigol.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/65003189638.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/difovufijizesobibev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/55280221570.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/etapas_de_la_auditoria_de_estados_financieros.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/16431444130.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_off000069ab.bin
9305308b857849427bfb442e62d18cf38145fcff6872544a0d5fdb2ab746480b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 5208 bytes
font_01_sfnt_off00007b83.bin
8a09b671bd52992335c58fa3b67f2a9bcd38b818439c1470b540782110f0bc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B83 10088 bytes
font_02_sfnt_off00009deb.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEB 4324 bytes

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