Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fafce5473cd9a6…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 19:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20f7a327325b2420f733a382f34d5f7 SHA-1: e487a946f7560b21eba95d052ccb1d337cd651ae SHA-256: c3fafce5473cd9a65a22f4560460e75e60bb89133369efe31ed7a8de15ca002a
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm or SEO manipulation, with a significant number of embedded URLs pointing to external PDF documents. One critical heuristic identified a link to a known malicious redirector, indicating a potential for malicious payload delivery or phishing. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bets10+mobile+android+indir
    • http://files.winsberg.net/uploads/1/3/0/7/130739918/penizeniga-lebowejefime.pdf
    • http://mizadab.llhsa.org/uploads/1/3/1/0/131070387/vukabe-madomewozedezid-voserabonaz-wofep.pdf
    • http://files.alquintaforestgarden.com/uploads/1/3/0/8/130813829/dddf84c.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/15516825295.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/porimigilidedutowemejidiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/96372878911.pdf
    • https://cdn.shopify.com/s/files/1/0431/9130/4343/files/top_github_users.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/98589250050.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/vasaxuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/skyrim_weather_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/33577063884.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.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_off00005ea2.bin
0ad605df531930e30da0c06b09c69c7a7c2189c583b405b17c1ebad560728411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA2 5352 bytes
font_01_sfnt_off000070b4.bin
7599e4aeb2c222c25b003d1d87656ac0ceb854968cdaa6841d2c01f9ba5c4c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B4 10136 bytes

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