Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2942bada314d41…

MALICIOUS

PDF

39.2 KB Created: 2020-08-10 17:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ea8ab2a440c9c4c1cfb8e9765e99b5 SHA-1: 4ab9f1d92b686ce2d4508289cfdb3bd52bca8e49 SHA-256: 5c2942bada314d4169d45148d35c821969805d0e353cc5c1b334cf848d1d5eea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the PDF's primary purpose is to lure users to this external resource. No scripts were extracted, but the presence of the malicious URL and the link farm heuristic points to a 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=elegun+inicia%25C3%25A7%25C3%25A3o+no+candombl%25C3%25A9+pdf
    • http://files.simplesweetskalamazoo.com/uploads/1/3/1/4/131407921/kukot-zufetavedos.pdf
    • http://files.emanuelaaureli.com/uploads/1/3/2/3/132302710/3397372.pdf
    • http://files.page28music.com/uploads/1/3/1/4/131453247/42e1dd64.pdf
    • http://files.moonbouncerentals.net/uploads/1/3/1/6/131637562/tavunowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/43795552918.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/gunobojipomitewipozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/fabixezolefama.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/8329468696.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/76903216411.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/44710630909.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/82943432318.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/if_key_exists_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/35172836720.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/fojaxolovakizowilumina.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/delonukuparal.pdf
    • https://cdn.shopify.com/s/files/1/0447/6341/4682/files/dipegeko.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f89.bin
81f55e60f67515000fba67bf3404e24b1c0ee54b191b6177b22630201a4e9e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F89 5940 bytes
font_01_sfnt_off00006295.bin
3a35fd81fdd1347a341ecc8a3914cb3d55437919e809bfebd97243e2ca657384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6295 14972 bytes

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