Malicious PDF — malware analysis report

Static analysis result for SHA-256 541426ca7ba7c305…

MALICIOUS

PDF

49.6 KB Created: 2020-08-31 13:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d2b56aeca35fae3486a5c36dfc1134 SHA-1: dc28d769f4a316ad56bdb4692200aff2959c9dfb SHA-256: 541426ca7ba7c3058065bdae4b2e44195da26dde4794b548c904f52783c10d6f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly the one pointing to 'ttraff.ru', are indicative of a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a broad attempt to lure users to potentially harmful sites.

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/wix?keyword=bangalore+cdp+2015+map++ppt
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/fesagijalerewevaxawinexe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/73885710162.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/acta_constitutiva_sociedad_anonima.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_52a719d2ce3c4afa8fb3e7ab5fa6084b.pdf
    • https://static.usrfiles.com/ugd/de02f3_9b720e8881244a3b948fbf7f7e38af6b.pdf
    • https://static.usrfiles.com/ugd/576447_3ef7a1cbacb64eba8b86b974a24ae716.pdf
    • https://static.usrfiles.com/ugd/c8a981_7efd1b3915534d3d92a4e463ef2cb96d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbe70f2f25074dabbed2f35ee81cf7bc.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/napabotidikavazuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/43051746921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/29602629240.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/48138468968.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/gunz_the_duel_private_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.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_off000079ce.bin
36730cebf61f340b58a4eb7a34192cbb4449345a2888e2105941a74514317c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CE 5716 bytes
font_01_sfnt_off00008d2d.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2D 1800 bytes
font_02_sfnt_off000095bb.bin
f6cd3723fb115eaccdeeb8e5bdbbaa56bb14792b699c3612a6e17b676484b1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BB 10484 bytes

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