Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c4c1dd7ffe455c…

MALICIOUS

PDF

108.9 KB Created: 2020-08-29 11:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277f97babcc786667b43414014150aa4 SHA-1: 4bdc9cfbac56b4807949fa444e1f758ffa5fb152 SHA-256: f7c4c1dd7ffe455cadfbe51035e0473b4d6471a713091254ff57bbfbc97af6c6
174 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with this finding. The presence of PRC/3D content and a large number of external PDF links suggests an attempt to obscure the malicious intent or engage in link farming, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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/wix?keyword=lenguaje+escrito+morfosintaxis+funciones+de+las+palabras+pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/cd_booklet_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/resident_evil_afterlife_full_movie_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/xonajunibozojirulijotel.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/letiperelaridi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/ribigaxaxoz.pdf
    • https://static.usrfiles.com/ugd/b8c837_795a27cc9831486e84d660e9bb962dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b71178487f704287a6a27ae5abc15c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5f625c377d245b1b696cb30dbd315c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_460e621536cd40388d6caf65b8a8bf42.pdf
    • https://static.usrfiles.com/ugd/b8c837_83ed7fecf43645cf9dda821df40c48f0.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/nekutoserupob.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/32685257298.pdf
    • https://cdn.shopify.com/s/files/1/0465/0159/3246/files/phyllo_pastry_sheets_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0435/7832/7199/files/19759836711.pdf
    • https://cdn.shopify.com/s/files/1/0439/8671/4782/files/linugavikuxeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad8f2148d84b52aa9d9178b43073df.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee522dcdb15c424eaa5624945089bed2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d526a8d92843e3980dc44cb9cb89af.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5696e3f709347e98e4e32ffb672a74c.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_off00016bb2.bin
700bb06820c088a745cd481ddc434f6b2df6d5685f2e6e29df2920a1b81dc1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB2 5700 bytes
font_01_sfnt_off00017f12.bin
1990664cde4b2cf0df6e2e2295b17dde3690bbe91c3021f24952659128cd1522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F12 11284 bytes

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