Malicious PDF — malware analysis report

Static analysis result for SHA-256 d004c7ef8322e96b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-01 13:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb0a8ca86f1af8e442f410aa9cb630d SHA-1: 00d1526b963a349e27eba83e23f8d51ce2be53e8 SHA-256: d004c7ef8322e96b383668eaf87805623a476231bdc21f12cddb5d6310a8afbe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=animated+discord+emojis', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/pify?keyword=animated+discord+emojis
    • http://files.redriverthunder.com/uploads/1/3/1/8/131858916/fba149.pdf
    • http://files.crappyclassics.com/uploads/1/3/1/3/131379246/6be65cb8802929.pdf
    • http://files.rochonsandshall.com/uploads/1/3/0/9/130969680/vavegupuwo.pdf
    • http://files.samgolong.com/uploads/1/3/1/8/131856330/busenupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/31545968832.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/toxap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/52360193546.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/puratutaxusumogaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/zulizaxesemubipegoben.pdf
    • https://cdn.shopify.com/s/files/1/0433/6258/2693/files/nokeku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/ponenilevenewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/24407816631.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/servsafe_manager_study_guide_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/tuveromibitu.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_off00005a21.bin
50a2f6badde6975a2affcf4ac70211d1b2250a6f8f13b15b86c1e2a0b245e2f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 5116 bytes
font_01_sfnt_off00006b74.bin
a090ab55424ef26e319ba383272a7852cc9964d1255a70c3a12d2164ae915a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 10120 bytes