Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c3b4c0f672982…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 07:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2a4dff093b8b9b654d8640796ca9d2 SHA-1: bfc5fea0e79f86b3a7e2f181af52ca6042053d87 SHA-256: ed4c3b4c0f672982272639653651170aea81d94affce633a3227285b3bd914ba
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for distributing malicious content. One of the extracted URLs, 'https://ttraff.com/pify?keyword=marguerite+yourcenar+livres+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to external PDFs hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious.

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=marguerite+yourcenar+livres+pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://rimet.alexandracr.com/uploads/1/3/0/9/130969762/4170981.pdf
    • http://files.americanindianbandmusic.com/uploads/1/3/0/7/130775922/49365d.pdf
    • http://files.thrivingdrs.com/uploads/1/3/0/7/130739996/29fd5b.pdf
    • http://gitufafiv.missinglinkbrewing.co.uk/uploads/1/3/1/4/131452883/6921098.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/41121525084.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/71177283248.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/belajar_microsoft_excel_2020_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/pokafuwomamorijin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/achalasia_cardia.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/nalod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/56754106738.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/apokriewe_boeke_van_die_bybel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/lusepunijamivuviveta.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/abruptio_placentae.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/59885972744.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_off0000675e.bin
76570bc261f0535065589d8eb104e7075fee068b7a738f2d9783b6eba9759ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 5488 bytes
font_01_sfnt_off00007a39.bin
09e53e63df617fea74f43ecad5fc61d7aec8b36aa36055b372eaf21697298786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 12804 bytes

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