Malicious PDF — malware analysis report

Static analysis result for SHA-256 7706ba0665d0ace4…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 05:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 833b731370c4694316d4481ffe68c66e SHA-1: cb91dae58903a0c98a15c274fb20fe18f2687ae4 SHA-256: 7706ba0665d0ace451b42cb71f2279b74e36c1d629d475a24680c6a3185e5cb8
202 Risk Score

Malware Insights

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

The PDF contains a lure for remote support tools, specifically mentioning TeamViewer, and includes a link to a known malicious redirector. The document body and heuristics indicate a high likelihood of this being a phishing attempt to trick users into installing potentially unwanted or malicious software. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=teamviewer+13+cho+macbook
    • http://files.ms172.org/uploads/1/3/1/3/131380008/7bbdd5c7fe685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/0813/0981/files/23839374891.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4614/files/animated_cartoon_creator_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/jijivinet.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/gukaratomovije.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/12221607294.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7702/files/maxidiwirajarotilafutet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxumadebamapetutorobegew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/budelefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/bojeloxosabejeviv.pdf
    • https://cdn.shopify.com/s/files/1/0441/0192/7064/files/tijomukupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/39004303852.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_off000063a9.bin
1cb0b27376126ccc684405c23e29ab419ed9508342007526e75d34255d8dbfd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5348 bytes
font_01_sfnt_off000075d7.bin
9f80f3d7a9ad6518f5eeb79251650a75c07a9d1605bbbd5da4a00bb53cc9338d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D7 10840 bytes

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