Malicious PDF — malware analysis report

Static analysis result for SHA-256 6972d4d8292560da…

MALICIOUS

PDF

43.1 KB Created: 2020-08-21 21:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85f1cb81ef2c7467c87e4c3cfeca579 SHA-1: f88108ebf094695531c9967329694c4f77a06731 SHA-256: 6972d4d8292560dafd08f60101860e59fa3f7023845c72adfeebfb5f21223a9d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=best+master+thesis+template+latex`. Additionally, it exhibits a PDF link farm behavior with numerous external links, likely for SEO manipulation. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=best+master+thesis+template+latex
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdf
    • http://murizovov.olivialevez.com/uploads/1/3/0/9/130969465/nupiwada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0454/2480/3998/files/accounting_terms_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/82556598335.pdf
    • https://cdn.shopify.com/s/files/1/0448/0840/5152/files/beethoven_moonlight_sonata_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/71882574181.pdf
    • https://cdn.shopify.com/s/files/1/0438/1877/8781/files/28905182090.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/food_drive_flyer.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/munupenakesepibapanuwamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4922/9220/files/joseph_shoes_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/52413840709.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_off000069e7.bin
c832a92674c337b8876bb7755392050211dda096407f9a862e05185e103ac032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 5176 bytes
font_01_sfnt_off00007b60.bin
febe25af31a9d7aa5d62d2d0cc0da68987d3eb16c47519cde4fb15f83e9698b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 10704 bytes

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