Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9ab334cebc51fc…

MALICIOUS

PDF

43.4 KB Created: 2020-08-02 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64e40e505d60ea27ca8dda3de0c477d SHA-1: 664e6d1aa9baed2341e72b9cb466f69c1a968a28 SHA-256: 8a9ab334cebc51fcc2cd4f3c414c086d639f7340a3ef4043bd4c8ff40ed8f282
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used to obscure malicious destinations. One critical heuristic firing indicates a PDF redirector link to 'ttraff.ru', which is known malicious infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=cen+tech+digital+multimeter+p37772+manual', suggesting a lure related to a multimeter manual. The presence of numerous shopify.com links and other file-hosting domains suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=cen+tech+digital+multimeter+p37772+manual
    • http://files.thecotswoldsgentleman.co.uk/uploads/1/3/2/6/132681877/ca98ee9.pdf
    • http://files.tidewaterclassical.com/uploads/1/3/1/4/131437669/4190761.pdf
    • http://files.percybio.com/uploads/1/3/0/9/130969717/zugufupewogaz_gusefukenoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/game_maker_collision_with_wall.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/52012610943.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/fazofinonigekusokaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/53197193665.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/semaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/ribumezoxezexavumuxosusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/the_eye_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/lexupunugebisireba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/jofobapefajinusemidukir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/9539121818.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/psychology_myers_9th_edition.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_off000069ad.bin
9bea68087973cbf654174cda89fc01378df2354e7c6d017fd7517eeaa31b8ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AD 5588 bytes
font_01_sfnt_off00007c8a.bin
314b8036a2fd8f38973a27ca35bb3279858b317e8a50f6aab76c3b58f3202c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8A 10580 bytes

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