Malicious PDF — malware analysis report

Static analysis result for SHA-256 306cf90c2563a762…

MALICIOUS

PDF

37.4 KB Created: 2020-08-01 01:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f830ff9a39e015c5feb37f7abda73964 SHA-1: 5725a4895108949089332c35699ba83060541290 SHA-256: 306cf90c2563a762611c2638ebc95974cd38083b8f615e60cbf61347bd9b1044
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a free download for Autodesk Inventor. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, which indicate the document is part of a link farm designed to drive traffic to malicious sites. The ML classifier also 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.cc/pify?keyword=autodesk+inventor+free+download
    • http://files.trailffest.co.uk/uploads/1/3/1/3/131398419/ae7f5d26.pdf
    • http://files.heidysbox.com/uploads/1/3/1/4/131409574/93900e8c1dfb263.pdf
    • http://files.thebuttonbadger.com/uploads/1/3/1/6/131637104/gaxuzasax_takima_matizuzawag_dupavi.pdf
    • http://files.darkersmathhub.com/uploads/1/3/1/4/131408068/pusixoredudeza.pdf
    • http://files.mikesilber.com/uploads/1/3/0/7/130776142/tozuvonume-pagogitaleden-luwolipafe-fubizo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/duzimedeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/vadakuzebidowusowizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/98712380437.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1400/files/rumobijozinenelatasapigu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/8759371877.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/bolojaguzuvegagobunizerex.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0631/files/jaxokibowevobol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/14733683975.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/nozisevix.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/buxibawovukapiged.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/gelilu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051fc.bin
812aed0316a3a281b12ad3fc4092a404e917dacd55aa462fee43764ad53ed09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FC 5104 bytes
font_01_sfnt_off00006384.bin
6e2ce176b5ccf28a12282aee117d606e698bc6adc2fe01662276daf6ec8094e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 10352 bytes

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