Malicious PDF — malware analysis report

Static analysis result for SHA-256 143aa85aab656f3c…

MALICIOUS

PDF

42.5 KB Created: 2020-09-01 17:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806df9f2485edc33bec9c2e4ac4c3fdb SHA-1: c6ca6634860b9eb96ddbdc7dd7b46d0e4ece78ac SHA-256: 143aa85aab656f3cefa53112988714e195c4b6dd6a571de618978a4a2c9950eb
154 Risk Score

Malware Insights

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

The PDF contains a link disguised with keywords related to 'Tamil new movies hd 2019' which redirects to a malicious URL. It also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, and the embedded link is a critical finding.

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=tamil+new+movies++hd+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ef253e_260fb85a855642e6b2fafb26a31d8fe2.pdf
    • https://static.usrfiles.com/ugd/f1d680_c9b360c79d804416becc819a1991eceb.pdf
    • https://static.usrfiles.com/ugd/0511f5_3ac369924137452d8617e460b1c05cd5.pdf
    • https://static.usrfiles.com/ugd/37428b_087673e77c3d42e984799927f7c9a26d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cee671552ef741289eafb298edd3806e.pdf
    • https://static.usrfiles.com/ugd/87fdc7_367a657ebe024c2c9c0fe94473aaab23.pdf
    • https://cdn.shopify.com/s/files/1/0461/9164/0739/files/rarudimoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/nufufozemuzewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/85343076841.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/50435103335.pdf
    • https://cdn.shopify.com/s/files/1/0447/9657/5904/files/the_barrytown_trilogy.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660e.bin
af05e1f3a0b88bfc32e45e8093dce918a30a5f53665ff07d5ead34ac7a006482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 5552 bytes
font_01_sfnt_off000078de.bin
633bb7ff6dfc9d6eebd1bdce8be73a885c840a88433afffbae14112e2b921ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DE 10748 bytes

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