Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2d7aeba47cf607…

MALICIOUS

PDF

48.2 KB Created: 2020-08-02 03:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37e8196c88cc86bd00252d0303f68c1e SHA-1: fbc0ff2e5bdc2e8cc4e3a79ab8db8b33e202eddb SHA-256: 7a2d7aeba47cf60778e65fbd6e62c703426b625f18e955bb0c7fde2034e83970
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, including a redirector. This suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine a specific payload delivery mechanism.

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.ru/pify?keyword=rains+of+castamere+meaning
    • http://files.oxfordclimatesociety.com/uploads/1/3/1/3/131398497/rubuwolo-wateguv.pdf
    • http://files.heikesfamilyfarm.com/uploads/1/3/1/6/131606208/vodisojeweba-xomifejeje-kemovilomasi-tukiwelerorab.pdf
    • http://files.cabinetsbywillowbrook.com/uploads/1/3/1/6/131606227/seromapadimogipog.pdf
    • http://files.burrowsmemorial.org/uploads/1/3/1/3/131383319/a9c859aae30.pdf
    • http://files.puredogbreedregistry.com/uploads/1/3/2/6/132682806/xikokesajego-kujemono-dokonajomiped-daroxirigob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/lositaxemosibuzafolibur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/rilugebilewuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/40839952081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74523611049.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/32561220355.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/vezujuridivotetowij.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/xujiromari.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/84810475402.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/50440478024.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/dizupazixug.pdf
    • https://cdn.shopify.com/s/files/1/0437/1339/6901/files/71014397475.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/86792826006.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_off000069a3.bin
bd4d89cea0f66c127e8c304f8e602e2777e2a2fa1a7485116f2cf4ea3626560d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A3 5176 bytes
font_01_sfnt_off00007b32.bin
276de69091dcc7b9dfd8d1886f439df3bc99ea4bbdd9f17f719f393c7590e125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B32 10196 bytes
font_02_sfnt_off00009e38.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E38 16204 bytes

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