Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fec98cdfe55d6b6…

MALICIOUS

PDF

47.4 KB Created: 2020-07-31 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edca66118ec1a3af91fd53387345ca10 SHA-1: 347f6aa8dc48d92035aa3250f55d11ef3c439a67 SHA-256: 7fec98cdfe55d6b692b8bc3e663069e34748d8f1b724d2488be59e0f67f10689
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=alef+bet+song, which is part of a link farm designed to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or redirection attack.

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=alef+bet+song
    • http://files.morelliupholstery.com/uploads/1/3/0/7/130739719/3869130.pdf
    • http://files.nursingarchivesassociates.org/uploads/1/3/0/7/130775634/9700667.pdf
    • http://files.unitedmissionsofhope.org/uploads/1/3/0/7/130738621/gujojomag_welabij_zijazamakap_salaxofu.pdf
    • http://files.slmdigitalmarketingsolutions.com/uploads/1/3/0/7/130775309/5476061.pdf
    • http://files.euroforestireland.ie/uploads/1/3/2/7/132712139/viregoji-vikeluzavagates.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/feloripazijuxovuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/80722983213.pdf
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/najipazepipomulidagapirup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/defujisonugosezugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/49755904478.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/jelebugenidabedusexumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/derepixoruliro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/526428265.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4583/files/wegogedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8365/1490/files/xemaxumabomewaluxubimobox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/2581969173.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_off000061da.bin
c0039acaaa00a73568802dddcc4c78b42a0197133f7e5a36113e9a0dfb259145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 4500 bytes
font_01_sfnt_off00007133.bin
458dcde9b4f20428a66dfeb614a84c1e3c3bac7454ff49e0fd2df657187b6c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7133 15376 bytes
font_02_sfnt_off0000a28b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28B 4324 bytes

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