Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ccb16844479c88…

MALICIOUS

PDF

54.8 KB Created: 2020-08-06 18:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46283892d5b7f787f4850682a779f3d SHA-1: c4e55e6e173085dc34b287be026c1b5eaa048580 SHA-256: 27ccb16844479c8809255e3c0978d1b2bf6d750f6aabe1f304928c0784ce23cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, including a critical malicious redirector at 'https://ttraff.ru/pify?keyword=acetone+butanol+production+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to what appears to be a link farm hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for malicious redirection or phishing.

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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=acetone+butanol+production+pdf
    • http://files.lord-and-associates.com/uploads/1/3/1/4/131437484/3558899.pdf
    • http://files.miketheprinter.net/uploads/1/3/1/0/131070476/gunifovuporot.pdf
    • http://sipevozu.aqeek.com/uploads/1/3/1/4/131452977/e9dca3336.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/zegabibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/zixexifof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/7800381941.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/87524388112.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/gepikidekopumezul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pagujusevidunevaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/36644942438.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/vibaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/javatpoint_core_java_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/wolff_in_defense_of_anarchism.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000772d.bin
047b7e678ac8ee5afef8d47710696a5ec373f1d52d5ae5877c2833d70871d32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772D 4980 bytes
font_01_sfnt_off0000881a.bin
cbb8ee4979aef824e976092de2de02eed47593c2831ba1694e8791102eb69c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 10100 bytes
font_02_sfnt_off0000aacf.bin
ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACF 16148 bytes
font_03_sfnt_off0000bfc7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 4324 bytes

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