Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23eb85508128430…

MALICIOUS

PDF

66.4 KB Created: 2020-08-12 08:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 081cb7281a3e5cbf6b6acb71bc1a36e2 SHA-1: 7a7b2e89107565d2d5ad2562c9a5e6fb50a753d8 SHA-256: e23eb85508128430b3da3c43743be64c260613f9993d964328dabf47977c1775
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 identifying a link to a known malicious redirector at 'https://ttraff.cc/wb?keyword=revolucion%20francesa%20causas%20y%20consecuencias%20pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to external PDF files, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection attack.

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/wb?keyword=revolucion%20francesa%20causas%20y%20consecuencias%20pdf
    • http://mudaniten.earth-commons.com/uploads/1/3/0/7/130739704/8de7da085b4149.pdf
    • http://files.michelletjohnson.com/uploads/1/3/1/4/131407424/6387409.pdf
    • http://files.tantricshadowcoaching.com/uploads/1/3/2/3/132303359/jakepikimosip.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/58096544798.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/wowonokero.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/bonebabibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/telologexulokolelojire.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8233/files/bibel_deutsch_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/juan_tamariz_mnemonica.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/south_africa_outline_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/58705820533.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/14506839271.pdf
    • https://cdn.shopify.com/s/files/1/0447/9533/0717/files/biggest_cities_in_the_us.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/60959654850.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b9.bin
7b6f393af31a226bc4f9335cd9a41fc561e271a9b17b788d2819aea48c64f1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B9 5120 bytes
font_01_sfnt_off0000c83a.bin
962aa076412462fcdff2993bea459c9c6c5c4958de5220f4366cbe210eee3af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 11136 bytes
font_02_sfnt_off0000ec89.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 4324 bytes

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