Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cbb7cf36409ea9…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 10:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f550ef7ef032b5a9c6eac4b1246cbcc3 SHA-1: 3c8623ed6d5fd7af85773ac6be6e575381f9c67c SHA-256: b0cbb7cf36409ea91ccc4a72a66d859c574a9d61e422aa4853e8d97232f6fb41
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=gareth+gates+anyone+of+us+video'. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains, likely part of a link farm or distribution network.

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.com/pify?keyword=gareth+gates+anyone+of+us+video
    • http://files.bkengineeringconsultancy.com/uploads/1/3/2/6/132681033/gurizusafizek.pdf
    • http://files.himoart.com/uploads/1/3/0/8/130814226/5159002.pdf
    • https://cdn.shopify.com/s/files/1/0452/2721/2957/files/57839449504.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/xotela.pdf
    • https://cdn.shopify.com/s/files/1/0437/7772/0469/files/xesofalorapigav.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/47138355941.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/sevogamofaweviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/trastornos_del_metabolismo_de_purinas_y_pirimidinas.pdf
    • https://cdn.shopify.com/s/files/1/0437/4088/9240/files/50894613776.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/vezugavusoperewo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5037/files/28321467756.pdf
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/american_history_textbook_mcdougal_littell_unit_2.pdf
    • https://cdn.shopify.com/s/files/1/0449/8325/5198/files/cancer_de_colon_signos_y_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/unicellular_and_multicellular_organisms_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/85450689850.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.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_off00005b8c.bin
0268a3ddf89ca97e45e6300483d2d25a7c05b88e4ea7c399fc924e3b2120e8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8C 5328 bytes
font_01_sfnt_off00006dbf.bin
3591a380eb8d0755a9e9d78efc632825c42052badbb11243f517735ef1e8bac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBF 10376 bytes

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