Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66793754c319a95…

MALICIOUS

PDF

40.1 KB Created: 2020-08-19 21:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e4a3fce62a7401419294a5630557ae SHA-1: 2cd9b31a738f7bb68fb3e69cd7cacb58d0e5e8ef SHA-256: f66793754c319a955bbd600d67e1a4aa565fcde15c2c6b09f253940b3c7c40a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to a known malicious domain, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site.

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=prisma+guidelines+pdf
    • http://zafev.sonsofitalycgc.org/uploads/1/3/2/6/132695663/dukob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/nirimufirisowevezukamok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/pilot_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/87011558578.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/50920918927.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8073/files/cursors_hack_pastebin.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6323/files/13618965959.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/lofimivizirujerudunekapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/43207421496.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/algorithme_et_programmation_c.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_off00005ce1.bin
a0121edce7ab4a2066b3063fe6c927824f450a62052c1a724ff6831875947d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE1 5360 bytes
font_01_sfnt_off00006efd.bin
32b7e9e1e6838c988d77296695133b7aa0a246092b6ccc442517fcc326296a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 10896 bytes

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