Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af9c9e44943c4e8…

MALICIOUS

PDF

36.4 KB Created: 2020-09-03 02:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102ffd7e814a40c283db6ed419d14562 SHA-1: 41a2d3940151fd1c16c99c71a025e318c4aeec1b SHA-256: 5af9c9e44943c4e8829be52f8054f912509e9d0181a4afef68c36f8dc00564b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for sheet music, which is then linked to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host a large number of links, likely for SEO manipulation or to distribute malware.

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/wix?keyword=russian+national+anthem+sheet+music+bass+clef
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5d26706714284b4f9fb624b41232f538.pdf
    • https://static.usrfiles.com/ugd/e948c1_cad572940f0c4f0f8ccc2525fb61d93e.pdf
    • https://static.usrfiles.com/ugd/c0a468_9ab3d1a3762a48e4833747805d8020a6.pdf
    • https://static.usrfiles.com/ugd/b9801a_05221ad82aac4715bb4d192c4b6ff529.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/22983449580.pdf
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/tirarif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/rapetufuvadalobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/alpha_oxidation_of_fatty_acids.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/98418710314.pdf
    • https://cdn.shopify.com/s/files/1/0461/9993/1030/files/34135815389.pdf
    • https://cdn.shopify.com/s/files/1/0434/9585/0150/files/patoliga.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/deweguwexifamutuzexil.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/zuregifowekidumaguzikimi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/blastomero_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/mibifufaxokitepukuzumiron.pdf
    • https://cdn.shopify.com/s/files/1/0462/3099/5095/files/ondansetron_zofran_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/chromecast_background_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/vegugaxiresemide.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005267.bin
5c6a39dfadceb45f8718c0790f9316aaf6e33ff589bc89bb19ec84f7658fec83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5267 5172 bytes
font_01_sfnt_off000063de.bin
7bc1447bf99099453d48d22b3cd7fe597cbbf046e17f49b3086db0b76cc13c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 9552 bytes

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