Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8e8215538f5bd2…

MALICIOUS

PDF

46.6 KB Created: 2020-08-04 20:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b46ad000c316084c8bdf0a7ae48db6 SHA-1: 6ff5fc4177ffdaa8d5a73f9dd2896849d36f354b SHA-256: ca8e8215538f5bd2b28ced0c1f44a0fb2e6d16ae27660d0f28c6f74ffd6d3e84
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm used for SEO poisoning or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the document body and link structure indicate a likely phishing or malware distribution attempt.

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=les+infortunes+de+la+belle+au+bois+dormant+punition+pdf
    • http://files.yogaflowlivermore.com/uploads/1/3/2/6/132681219/66073d414575ef1.pdf
    • http://files.eastcoastkubb.com/uploads/1/3/0/7/130740073/7396837.pdf
    • http://files.marthasvineyardgardenclub.org/uploads/1/3/1/6/131636866/bumiguv.pdf
    • http://files.gbdinc.net/uploads/1/3/0/9/130969389/46d431.pdf
    • http://files.openheartschildcare.com/uploads/1/3/1/6/131637108/d0b4f.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/25206334887.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/pexurogelotep.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/35052385119.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/celiakia_i_dieta_bezglutenowa_praktyczny_poradnik.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/pidazitudigenupije.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/46564065536.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/gezojigosudivovisuzu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/zuxurawadolotozekaboxixop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/stardew_valley_hidden_achievements.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/4206834423.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/46237049605.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/84852798331.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/
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/8485279833

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074e8.bin
01ce5356ab31af1c5131285b1400a578c4f841416083c06d778f81a2d896d6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E8 5268 bytes
font_01_sfnt_off000086b8.bin
8fee3e5ccc2d7ed3748c4496d1425ab854bdde6a3f3fe7f586e955b0360bde96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B8 12340 bytes

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