Malicious PDF — malware analysis report

Static analysis result for SHA-256 4123687633b47d39…

MALICIOUS

PDF

43.3 KB Created: 2020-08-28 14:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5c828769275d5809fbf366582244a5 SHA-1: 3a8db11a76cb169e0b52ceceb032ed75ef825146 SHA-256: 4123687633b47d39dc8d355014f380018287ca7959b7730555c439ff3fba479d
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the redirector link, suggesting an attempt to lure users to a malicious site. The presence of numerous links hosted on platforms like Shopify indicates a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination.

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=borders+thomas+king+lesson+plan
    • http://files.thevegantravels.com/uploads/1/3/1/3/131398242/2738229.pdf
    • http://files.pebblehurst.com/uploads/1/3/1/4/131482826/6345087.pdf
    • http://files.pyramidcafeshop.com/uploads/1/3/1/0/131070309/vagijebamowawusikefi.pdf
    • http://files.koksports.org/uploads/1/3/1/4/131437012/pizaxob_xutero.pdf
    • http://xarido.arthouseproductions.com/uploads/1/3/1/3/131379858/jegefinod_jasezixelunu_pudazagikibov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0452/8783/3762/files/garch_model.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/rapazuxevitizof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/29516820796.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/75147260610.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/bupukumesig.pdf
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/incident_management_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/vojagora.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/import_excel_spreadsheet_sas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de5.bin
b88327ebe88f17a536005df8f4b8469d058ce3550cc02731f75931329230581f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE5 5276 bytes
font_01_sfnt_off00006fa9.bin
16f584e35cb4991d6d2de4f001a6032791dc7720110c8599718d1834020e2dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA9 10124 bytes
font_02_sfnt_off0000924f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924F 4324 bytes

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