Malicious PDF — malware analysis report

Static analysis result for SHA-256 640ec58a01d6427a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 08:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90823edcce9f10ec9f6f8c815eeb5195 SHA-1: 58ad514885b75864044292e2e3057c4ca140f63f SHA-256: 640ec58a01d6427afde024fdba8a0d3bf27d8413b6df93a05041754d0bb4abde
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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=honda+hornet+919
    • http://files.centralcaldirtdogs04.com/uploads/1/3/1/4/131438427/tonebaxa-mojalujapako.pdf
    • http://files.globaltransgroup.com/uploads/1/3/1/4/131438641/7fba4d9e.pdf
    • http://files.poplarbluffdancestudio.com/uploads/1/3/2/6/132695472/5281392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/voxoxitozep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/zinorumijopavagutunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/vakipekusig.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/38112589027.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8022/files/hurley_dispatch_hotlist.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/pepedikokukixiziputof.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/4025581907.pdf
    • https://cdn.shopify.com/s/files/1/0437/0228/8537/files/bejumeromijozinilenafares.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/sesava.pdf
    • https://cdn.shopify.com/s/files/1/0438/2271/0941/files/99724532861.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/vanubedebudozixofigogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/defarebitobidirevowatezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/fegaburikolexagawilugiza.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_off000062e0.bin
15be2bc6b049712317be956be9e57c980054fd0526e8ab64510065ee74df41f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 4872 bytes
font_01_sfnt_off0000736a.bin
92c82f65496f52b57152134623096542ef769de4fe31281c2f2ce73c36ad1efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736A 12028 bytes

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