Malicious PDF — malware analysis report

Static analysis result for SHA-256 f026ab939c8de019…

MALICIOUS

PDF

63.0 KB Created: 2020-08-29 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e18a1e370f38c66d2b6376041168308 SHA-1: f62b1304a96873d6899fd6eae396fd5ca52b1697 SHA-256: f026ab939c8de019415415ef2c30e7f32a45ece62d9c06d38fe52e67d3d863d2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains a critical heuristic firing for a malicious redirector link. The embedded URL, 'https://ttraff.cc/wix?keyword=elementary+number+theory+underwood+dudley+solutions', is presented in a way that suggests it leads to academic solutions, but it redirects to a known malicious infrastructure. This indicates a social engineering attempt to trick users into visiting a potentially harmful 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/wix?keyword=elementary+number+theory+underwood+dudley+solutions
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b85ed15068ba4997ba7323f1e4302bd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_98354f1194a24134a6492c032af1aa61.pdf
    • https://static.usrfiles.com/ugd/b8c837_337eaea437404630ab88b982952dc62e.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/24174307956.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/3d_maker_crack.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/naregifitowi.pdf
    • https://cdn.shopify.com/s/files/1/0465/3534/4287/files/datoxinufalanaloleminisol.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/fepekuzuvozubejopiluxo.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d5d119bc1b45deaae62c4b49be2046.pdf
    • https://static.usrfiles.com/ugd/b8c837_5360837f048243f5b64ed894b6c65273.pdf
    • https://static.usrfiles.com/ugd/b8c837_62539a1e6c3244a3834940be9032f67d.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fc83144f7545f687d0250a539dcb4b.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009613.bin
4ab595aa97da74a17775c0097283e3a4ce0840bb9d2cd8a381b5446cdb91421b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9613 5236 bytes
font_01_sfnt_off0000a7b7.bin
d53045fc93c2381bfbd8d90ed2220841999883424c4afbda550d12fd089e4f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B7 10308 bytes
font_02_sfnt_off0000cb2d.bin
9e2c1fa8a43411e11ae04deb3108e8560f8b5d883638500a1afd3f4ebef517a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 16088 bytes
font_03_sfnt_off0000dfe9.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 4324 bytes

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