Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4823258a040e81d…

MALICIOUS

PDF

38.4 KB Created: 2020-08-15 18:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4a77c6a2e011e92c977d3204d8425df SHA-1: 6f6d81f10dd7136498850e5bff1d6cd48b03cf3a SHA-256: a4823258a040e81d6018d2fe23889619a998712ab2b693043c02c422ac716379
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=compress%20pdf%20online%20less%20than%20200kb'. This indicates a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=compress%20pdf%20online%20less%20than%20200kb
    • http://files.quicktan423.com/uploads/1/3/0/9/130969573/detuko.pdf
    • http://files.flokku.com/uploads/1/3/2/7/132712093/gufixesifutoxav_zagibezavof.pdf
    • http://files.westfieldboyssoccer.com/uploads/1/3/2/7/132740445/b01b3cde64.pdf
    • http://waredawom.calone.studio/uploads/1/3/1/4/131437792/c2b568.pdf
    • http://files.zohabharwani.com/uploads/1/3/0/7/130775665/10ecd.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/zenenoli.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/49347405085.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/vuwutikajelafuwoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/36726675056.pdf
    • https://cdn.shopify.com/s/files/1/0433/5956/8027/files/paralajapazazafexipowujim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/noxiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/womoroj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/kukam.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/fijimabuxuminuridupifag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/welujefaxunafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/6850838342.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6278/files/endnote_reference_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/14087818938.pdf
    • https://cdn.shopify.com/s/files/1/0429/2716/1507/files/jekedekumadosudabof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005661.bin
c4f4020dd889ba7e2864bc1a5ec5333b989906598420c20f273b19b014d7b114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5661 5664 bytes
font_01_sfnt_off0000696c.bin
efdf66c177eaced919fe5bf43830ab323518799faf980d96b93d343408192059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696C 10260 bytes

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