Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e6304e6075ecf8…

MALICIOUS

PDF

42.3 KB Created: 2020-08-19 05:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f376bcc08a3e12aed4ddd8b5ed8baa6 SHA-1: c351165cb1c68fe2a94734fb658a6870e3fe84bb SHA-256: 89e6304e6075ecf873ca988baec52ab5a94d369d70601e5d3fe75d61a9a144d1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=notify+buddy+pro+apk'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient to classify the 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=notify+buddy+pro+apk
    • http://rivivufu.friendsofstlaurencechorley.org/uploads/1/3/2/7/132740285/9db7b0d5652b.pdf
    • http://files.rayslicenseplates.com/uploads/1/3/1/0/131070912/9af1da1ba57d.pdf
    • http://tolevore.iwaswarned.com/uploads/1/3/2/3/132303382/jolewixinosemafetedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/7030907262.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/77320180653.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/97509919831.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/brushless_dc_motor_theory_of_operation.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/novel_mockingjay_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0428/4320/9895/files/80149408303.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/business_process_outsourcing_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/pixatulisedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/bovanud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/anatomy_of_cardiovascular_system.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_off000051e8.bin
0e7f3bd92cb4379cddb2c708d422ea6c2390f3847445a8e8b1be86ca44ca06f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E8 5100 bytes
font_01_sfnt_off0000635c.bin
0e631ebd9cb578b993d3e8898150b11f3a801ed841c6b7986b6ad464338f6597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 10192 bytes
font_02_sfnt_off00008678.bin
1a82f0eb0432454a61ce5f8d432852ec405de7420645a83d259848c269168e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 16436 bytes

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