Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7a11879ead5712…

MALICIOUS

PDF

48.8 KB Created: 2020-08-25 19:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec93527da770cb6ffe379f6ce749d54 SHA-1: 01248beb00e546e68b99313e9631bfc3e0c906d5 SHA-256: 8f7a11879ead571235565b760686ba2b5cda87430712b257a94a7006e4addc12
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=comprension+lectora+dibujos'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning tactic. 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=comprension+lectora+dibujos
    • http://xigixufaw.ana-ramirez.com/uploads/1/3/1/3/131383373/buwezi_bujuk.pdf
    • http://files.veilofyork.co.uk/uploads/1/3/1/1/131163846/pajelananow_vigizerir_tawufitimiwa.pdf
    • http://lovul.lotusranch-homes.com/uploads/1/3/1/4/131454215/savupuvesun-jorunazan-muwamanija.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/46002285839.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/area_of_circles_sectors_and_segments_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/tiseganewidajepav.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/89420803107.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/cfmeu_wage_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0453/9875/3448/files/at_the_beginning_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/65128360795.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/26462007559.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/39158157159.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/28634985443.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/19874636851.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/erie_county_water_authority_report_problem.pdf
    • https://cdn.shopify.com/s/files/1/0437/4983/4901/files/tobakipipajutito.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1e.bin
fb36b401bd6d44c2ff33147f324af1f4842dd56b55758be315b166acd70b4b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1E 5340 bytes
font_01_sfnt_off00007113.bin
61ccb5a04332903f5f59a3116addffa22d45dad8b5b4bce34f55b280cf38a974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 4624 bytes
font_02_sfnt_off00007db2.bin
f533f037cc2e4124a9bc5294e5cdbab2c6a5f5642ba307b74824fd1b2c74948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 10516 bytes
font_03_sfnt_off0000a139.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA139 16036 bytes

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