Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df2c43bb9af42be…

MALICIOUS

PDF

55.3 KB Created: 2020-08-18 18:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fefbe10dcf0cf22dad24ca27e8d9827b SHA-1: 6beb85967af3497e36d77004ad68a74d94c4b52f SHA-256: 5df2c43bb9af42bef0d499e9674cf20ba71451820344924908467e4fbdfd8cd9
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=video+er+professional+opera+extension'. It also exhibits a high-risk heuristic for a browser extension installation lure, suggesting a social-engineering attempt to trick the user into downloading or installing something malicious. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=video+er+professional+opera+extension
    • http://files.bmwenthusiast.ca/uploads/1/3/0/7/130738765/1ef63523b.pdf
    • http://files.yizhixu.com/uploads/1/3/2/8/132813998/ba465a021b0.pdf
    • http://files.thealleghenyinstitute.org/uploads/1/3/0/8/130813054/4180539.pdf
    • http://files.worldwarc.ca/uploads/1/3/2/3/132302939/dutilegisodiwikepapu.pdf
    • http://files.fiorillobuilds.com/uploads/1/3/1/6/131637701/7953330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/sulizivapugoxonepuvaped.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/cellule_vgtale.pdf
    • https://cdn.shopify.com/s/files/1/0438/0049/4241/files/45286022172.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/nukugekawisezunafifetopox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/rareluluwibova.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/3129114987.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/kerulazonuluzaxowotezuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/37007948571.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/convert_website_to_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/gesewukip.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/sugitifesikikobisul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ff8.bin
74c10095a4428968d9adcb46a947adc3f6574b7acf18fd4d08dd2884bd65eff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF8 5068 bytes
font_01_sfnt_off0000914f.bin
1b4d7e1eb3d967061c947ac6412ed0d8d8c74338c913a4ba6ff438d396ebecdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914F 12716 bytes
font_02_sfnt_off0000ba7b.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 16204 bytes

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