Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b0f43fa0cad1f6…

MALICIOUS

PDF

39.8 KB Created: 2020-08-23 09:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4db4b60a89521b6021b9ca998715bc2 SHA-1: ffbf8d9d9948d732e9be4dbb0ec21c962ce05f69 SHA-256: f0b0f43fa0cad1f602650b3e057d48415f0d449d1bb8aca1637a30241725424b
152 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. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to a 'Cisco finesse agent user guide' and includes the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=cisco+finesse+agent+user+guide
    • http://dukelu.fortythreemarketing.com/uploads/1/3/2/7/132740405/1626804.pdf
    • http://mebetajim.bluethunderbirdwoman.com/uploads/1/3/0/7/130739892/ruwetezare.pdf
    • http://files.tangentspole.com/uploads/1/3/0/7/130775402/rarasuxelibi.pdf
    • http://files.olghammel.org/uploads/1/3/0/9/130969809/wepaxawapafado.pdf
    • http://files.centrelinedesigns.co.uk/uploads/1/3/1/8/131856919/gofitubigop.pdf
    • https://cdn.shopify.com/s/files/1/0435/5984/6051/files/aci_sp_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/vekilefuguped.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/68026746008.pdf
    • https://cdn.shopify.com/s/files/1/0463/3228/0994/files/55870968720.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/doxoxowafojonigotekowop.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/tuwefirozeribuxeweziviret.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/sovikelipolajusudobuw.pdf
    • https://cdn.shopify.com/s/files/1/0448/0850/3456/files/31205858074.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/wintrobe_s_clinical_hematology_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6315/files/lotapafibep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nofalefupipalivudekim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/weather_channel_95531.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/luvobafodalotaso.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_off00005f2e.bin
77956db354977286629acdf57681ab855555db6010f75c50d4792da96187045a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 5064 bytes
font_01_sfnt_off0000706f.bin
499518a85728bb66845ec69493cfd3a642944d1a6daee3c8cb9e465c498c84ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706F 9936 bytes

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