Malicious PDF — malware analysis report

Static analysis result for SHA-256 51da8975ef2f9733…

MALICIOUS

PDF

67.5 KB Created: 2020-09-16 17:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e467469c93d98ccffe3754aba1c931ef SHA-1: 8de039fa007452688aa12012a17ef2dbd116e455 SHA-256: 51da8975ef2f9733d4fb200532e58a12ffc1c1f53c28eef05dc4068806210100
154 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.club/wix?keyword=the+covenant+halo+skull'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.club/wix?keyword=the+covenant+halo+skull
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/difajofunumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/calc_integral_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/1356126235.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/lazad.pdf
    • https://cdn.shopify.com/s/files/1/0441/2764/9944/files/limizivesisakutumozip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8515/8813/files/88449726126.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/exercicis_doracions_compostes_amb_s.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/ashe_masteries_s6.pdf
    • https://cdn.shopify.com/s/files/1/0454/1310/5832/files/banuwenabejobe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/86502383717.pdf
    • https://21fd8470-4682-42cb-b25f-9bc0d726b444.filesusr.com/ugd/29c71c_22d0a2cd1799428bac43f57311a9fe69.pdf?index=true
    • https://f4d9e22a-c649-4a7b-8568-1ad27aacc8fa.filesusr.com/ugd/80bfa9_1b17b97984a64fe49740f22687c9dc08.pdf?index=true
    • https://e075acfc-4bd7-4066-ab27-cf32ded3eedf.filesusr.com/ugd/dec231_46a1e2ae8a374feb93e473d81f7d97ac.pdf?index=true
    • https://02994391-4047-4f10-b93f-7edb5d6e73d9.filesusr.com/ugd/37987b_8b3f4fa1b9db4c82a3458c613ed36cce.pdf?index=true
    • https://ea5d09d0-9a21-4858-9cbf-78b29c8eaa9b.filesusr.com/ugd/3e7897_1732770bf0594edcb26ade0ead37cd3b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/8561/7566/files/vamigal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/92379203056.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/nejedakizefugidetevomow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/hemicrania_paroxstica.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_off0000bf66.bin
04740ad1d5ccdb939b585359a62184a50f44bac6d0f17c936ef3356769a2db4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 4696 bytes
font_01_sfnt_off0000cf57.bin
04e5c416bb1327dfb46ab34c87870bdce400644b699bd51a7bc75f40846d5f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 10224 bytes
font_02_sfnt_off0000f252.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 4324 bytes

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