Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f6cb613502bbe6…

MALICIOUS

PDF

55.9 KB Created: 2020-08-18 16:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a15c2d6d6d26f55bb1260d19e23e86c SHA-1: b88252b43e8ac165e0085c3ed82171afc5ecce10 SHA-256: 49f6cb613502bbe67225c34e125c0a4e2b71b2680733d2f4b1d97607f9b49078
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the same URL, suggesting it's the primary lure. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely for SEO manipulation or to host further malicious 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=android+tv+box+performance+chart+2019
    • http://fiwokuka.joke-emmerechts.com/uploads/1/3/1/4/131437949/meloxobajunew-dipekigigikebu.pdf
    • http://tepurosoz.mrusselldesign.com/uploads/1/3/1/8/131856257/dosefawedemuwajiwasu.pdf
    • http://files.550kirklandway.com/uploads/1/3/2/7/132740821/tagavavolapiwo.pdf
    • http://files.thedivadogs.com/uploads/1/3/1/4/131438461/vapivafukenekakabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/verification_of_kirchhoff_s_current_law_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/mexura.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/zolekejevozebaged.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/39238389937.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/valewizeluzakarixizarivaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/12850785248.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9428/files/jegegabivufovadijugokoron.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/revigesoxulapedogut.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/73462884338.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/green_bay_packers_injury_report_week_13.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/accounting_rate_of_return_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/75286352519.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_off00008765.bin
b45c6354c35d0099659e81aa00ca3b29db295959c6b1beef7a967b25f751a474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8765 5924 bytes
font_01_sfnt_off00009b69.bin
1173aed315fde6410e1f76b644a05d4e13bc520521d9acab82bba74c0ef6c769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B69 5004 bytes
font_02_sfnt_off0000ad7a.bin
060a6cccc35a338418e01e31d0312f651554af7a65cf86c0322d744f620eebd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 10864 bytes

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