Malicious PDF — malware analysis report

Static analysis result for SHA-256 651ccd2157a6101f…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 09:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ac79b14183040b3dfba43c99b58a38 SHA-1: b79b59c90642e863e952a81d5b59ab458702515c SHA-256: 651ccd2157a6101f32f9766fe17005c98d67fb0bb8703a8c97a070b2656dba80
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free software download, aiming to trick users into visiting a potentially harmful site. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm designed for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/wix?keyword=tasty+blue+free+download+full+versio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/90507468588.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/48951267652.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/arm_assembly_language_an_introduction_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/lewemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7432/2586/files/45237360955.pdf
    • https://cdn.shopify.com/s/files/1/0463/2461/3275/files/kebek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/debotutisaduk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/56362269133.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc4e1d3c30f24c46a999aafbd0482c6e.pdf
    • https://static.usrfiles.com/ugd/d54300_249a52b5ec9d4fccbc32873e70d2c4f8.pdf
    • https://static.usrfiles.com/ugd/dd4472_38469537bd66484eaad38d4ff177c1a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b63ab28da6b54445acc7164b03dcbc32.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9df642da5774e1194a80f0934fb8a8b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f59.bin
1216382e0519a196e73ae52b8b3d836c6f22ca266029a276793ab2ff05b05374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 5124 bytes
font_01_sfnt_off000070e8.bin
d2e5626e9b7fbf0db871ad64af19f77e7df4a996c81fd3bddb7c076553608107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E8 10448 bytes
font_02_sfnt_off00009469.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9469 4324 bytes

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