Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cea0d50973e9509…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 18:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69740a0f3be0f584fd81808e11006c5 SHA-1: cc8108c6ab6d6ce2e587c038cb1197d768cf5bdc SHA-256: 7cea0d50973e95094f9e5d324ee4913a65a303ecc6d1260ad56799cd7b4d9602
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical link redirects to 'ttraff.cc', known malicious infrastructure, which is likely the primary payload delivery mechanism. The document body text and embedded links are designed to appear as legitimate study material, but the underlying intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=rrb+je+previous+year+question+papers+pdf+for+mechanical
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.kirschlaw.com/uploads/1/3/0/7/130776141/posujoni.pdf
    • http://files.helloweirdos.com/uploads/1/3/1/4/131452735/lobisepiwoval.pdf
    • http://files.smithsnonsensenews.com/uploads/1/3/1/3/131380733/begobimulo.pdf
    • http://files.bullets-n-beans.com/uploads/1/3/1/0/131070674/peroxixunik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/1825/9365/files/ceidg_1_druk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/58058377749.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/rubulujexibiza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6728/files/80544418866.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30036161276.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4520/files/43468793285.pdf
    • https://cdn.shopify.com/s/files/1/0446/3912/5667/files/ng_cli_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9186/0383/files/10919722123.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/95201792443.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/90958764874.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zirikojutatexonetabuw.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_off0000635c.bin
5effcd653110c8e05880f57e7c90ce51b377e4d65787578d36a044bd1c97a839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 5904 bytes
font_01_sfnt_off0000775e.bin
14060ac55ced71afd9eeb981a6bc65ba64eb3940aca516f3ecf71d6a30592559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775E 10364 bytes

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