Malicious PDF — malware analysis report

Static analysis result for SHA-256 4167301d9fd61ac1…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebad13830c7660765ae2c517dd3c122c SHA-1: 4dbe7b3a5a51ee364392dfdf2e0555c697434df5 SHA-256: 4167301d9fd61ac1d46cf2c16f6e896b234a00b333bcc9a74839ef0804cd1cb1
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=biodiversity+conservation+article+pdf'. Another heuristic indicates a link farm of external PDFs hosted on Shopify, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly supports the malicious nature of this 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.cc/pify?keyword=biodiversity+conservation+article+pdf
    • http://fagene.willparkermusic.com/uploads/1/3/1/1/131164250/7bfd7e.pdf
    • http://sefuxud.electricrailwayclubsflorida.com/uploads/1/3/1/8/131856584/ed4bd6.pdf
    • http://files.bayareaentertainer.com/uploads/1/3/1/6/131636632/68b8f04d85.pdf
    • http://vuxosagak.berberraftingadventures.com/uploads/1/3/1/6/131606407/turimofen-wokokovamewuv-wamalegugamuvi-guxugifexasinuz.pdf
    • http://files.music2dance2radio.com/uploads/1/3/0/7/130739919/pajogigo_tajaxunasine.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/roxopipowapofunun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/woxuvejibezasawokopipukaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/vafavaniloxenesizetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/centrifugal_compressor_performance_curves.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/foxiji.pdf
    • https://cdn.shopify.com/s/files/1/0440/2046/5829/files/jefuzatokexejisifage.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/15108688037.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/jomokof.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/line_break_remover.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/dasakiwaxajive.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_off00007335.bin
deda383d3be8ec56c88f6edfd21fafb2dae8f6fed7334dbcdae890c1b7ea7755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7335 5360 bytes
font_01_sfnt_off00008594.bin
e73437a5f330a172e3bc5790bcb528d1a0e9a4766045e61c96c5b9d8269238c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8594 10668 bytes

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