Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0894835b7a1b43a…

MALICIOUS

PDF

118.8 KB Created: 2020-08-14 19:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e45b642701c72e149db65f3ce06343a5 SHA-1: c62251c57f04bd9e322747d381cee94406be10db SHA-256: e0894835b7a1b43a8849d9a6196cf4d93c50e450824ae93f3c962a3e18b34c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.ru/wb?keyword=strata%20title%20act%201985%20(act%20318)', is flagged as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the idea that the document's purpose is to host links.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/wb?keyword=strata%20title%20act%201985%20\(act%20318\)%20pdf
    • http://files.bariatricketo.com/uploads/1/3/2/7/132741211/pamojuzoberinel.pdf
    • http://files.wfmessentials.org/uploads/1/3/0/7/130776268/9856746.pdf
    • http://files.synbim.co.uk/uploads/1/3/1/3/131383456/9723114.pdf
    • http://files.fulbrightpta.com/uploads/1/3/1/8/131871864/pomuwavizeta_tobabejodu.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/5343/9383/files/32260323033.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/lifodixinukevopasifofoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/22188603858.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/48306967915.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/12488364314.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96512150342.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/nivubijumaxibivodede.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/grade_11_analytical_geometry_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6283/6891/files/alfred_university_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/a_proposito_de_tu_boca_descargar.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_off000192ad.bin
43e9d2470d53826ad4ed44470ea5e007094434c1a4dbc14ecc1e1a04bfe290bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192AD 5920 bytes
font_01_sfnt_off0001a6e8.bin
1d4be5c8b78984bdb6974ad8b4ff76b83426c5ede50b2b9d46c426e60a8e043b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E8 12228 bytes

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