Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a9387255c65a6…

MALICIOUS

PDF

45.1 KB Created: 2020-07-29 11:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238f9ba08a5ebd1eeff54fb43a984d20 SHA-1: f4bcb8ccc41df24e2712dd4c0797b57721a3de64 SHA-256: a45a9387255c65a68285f4aa86f00163d8b7b07db7d978a51ad1f213641658fd
154 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, disguised as a link to "Berserk manga online pdf". The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or redirection strategy to obscure the final malicious destination.

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=berserk+manga+online+pdf
    • http://files.hawkecreations.online/uploads/1/3/0/8/130814874/jemifizolo_lolexabudoga.pdf
    • http://files.kefashion.online/uploads/1/3/1/4/131437880/pifumuvavevep.pdf
    • http://files.willowpath.com/uploads/1/3/1/4/131408502/0e95ec777b35b7.pdf
    • http://files.deshazogroup.com/uploads/1/3/1/3/131383982/4112505.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/30088193865.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/gatujebimul.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/gilunofizetimojabutazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/45688278500.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/49665242831.pdf
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/pigatejunidusolav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/dubarosikojematata.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/wukivarefojin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/76873353131.pdf
    • https://cdn.shopify.com/s/files/1/0432/1289/8461/files/gopiwubag.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/86218209657.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/gugazugepenodaminimubijax.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_off0000658f.bin
158f33433815bc1104d66a21ee8dbe17a38a75b572b5932986f53c0d944336e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 3444 bytes
font_01_sfnt_off000071dc.bin
71e80657c842b91d617074ecdfdcb8a591f1e82c608b26deb29a2e753d860605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 5180 bytes
font_02_sfnt_off00008359.bin
6259cd30e9b3f2eea9be7c040599fb1179bf918aaea980ee24d111237f843dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8359 9940 bytes

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