Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94eb96fa6d8a869…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 08:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2df9d32f6845b9e141946fb58a050cf5 SHA-1: 4980ea5515d78952815bc8aa47c02afe20a38616 SHA-256: a94eb96fa6d8a869e85d5952f7dd1a65dadb047f4e13884766fbb6cc19146421
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with 30 external PDF links detected, suggesting a link farm or SEO abuse. One of these links, https://ttraff.com/wix?keyword=yamaha+rx-+v777bt+review, is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent, likely for traffic redirection or further exploitation.

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.com/wix?keyword=yamaha+rx-+v777bt+review
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/nixudusutafoponedow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/jugeliwedoburamabavofe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/suzanibuxajatepukowut.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/46315439599.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/gasedet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/61522951475.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/dataro.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/el_banquete_de_platon_precio.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/clock_hands_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8727/files/yamaha_rx1_snowmobile_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/sumiles.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_44a1880fd20142babd4d7fba13e2c0b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c1871b2c111469794a22ba57d7b20d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f0f3d8a588b4fbaaa6e81487594759e.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_off00006680.bin
b3c3a7ffff301d7ebc1999e0cacf62b136340aaf4172c21056833a924a4167e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 4720 bytes
font_01_sfnt_off000076a6.bin
6f99f307c5eb056bb2844ab704516269fdaaf690f464dfd04ddca9f023caedd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A6 10364 bytes
font_02_sfnt_off00009a0f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0F 4324 bytes

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