Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc4937fa5dd3204…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 16:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5824772bb04c359f4d8156e911b3168 SHA-1: 181a81d5379eaf45c0f16a7977dbd48f8a92bd51 SHA-256: fbc4937fa5dd3204b5035af99c63f85ee8c595b3f634fb4a70ad8e0bf5552895
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though obfuscated, contains the URL "https://ttraff.cc/pify?keyword=blank+drum+sheet+music+pdf", suggesting a lure to download further content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=blank+drum+sheet+music+pdf
    • http://files.ronwozny.com/uploads/1/3/2/6/132682646/narigokek_vofusawaponofan_vilixelu.pdf
    • http://lufaloxav.nearyouraltar.com/uploads/1/3/0/7/130775795/3442320.pdf
    • http://files.billinghurstorchestras.org/uploads/1/3/1/4/131407357/03772a75e78b.pdf
    • http://govajeje.canedymetalcraft.com/uploads/1/3/0/7/130740178/6934366.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/71315994071.pdf
    • https://cdn.shopify.com/s/files/1/0434/8064/5782/files/83932656827.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/33525595480.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/canot_get_to_recovery_server.pdf
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/53205579762.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/76921193981.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/72777788321.pdf
    • https://cdn.shopify.com/s/files/1/0438/5076/0357/files/flash_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/wufoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/algorithme_pcime_2020.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_off00005592.bin
57e7026893e7645d2d7f6a6fbc5bab7261fcab088bf68dc7d8f1532fee44e549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5592 6648 bytes
font_01_sfnt_off00006609.bin
102d0fa748e907acdaebba5e53ee77f1f8ead8da0f89dddab901a45c9b71c92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 5508 bytes
font_02_sfnt_off00007898.bin
1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7898 2116 bytes
font_03_sfnt_off00008244.bin
b35e9407555c29a48c4f4ed57c14ba16eb410d6654c4ad036d8390d27949ba7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8244 13656 bytes

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