Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16bb8c04f4a6a77…

MALICIOUS

PDF

56.1 KB Created: 2020-08-30 06:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b3a71132bb35ac3e5430c63f80eb00 SHA-1: 7cf57a9806b5fb26c56f4be2852b1eab475e240b SHA-256: a16bb8c04f4a6a7747db05f79a942b92c7aecc2b5739aea63bbaebb010f6d5c3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, which is a common tactic for distributing malware or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, suggesting an attempt to manipulate search engine results or distribute content widely. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence of malicious intent.

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.me/wix?keyword=sketchup+32+bits+2018
    • https://static.usrfiles.com/ugd/b8c837_e6354e190b664a148bc5c68eb631d4ac.pdf
    • https://static.usrfiles.com/ugd/c8a981_4a21cc074a934a4ca5ce42dcd96d7c58.pdf
    • https://static.usrfiles.com/ugd/23e9be_15c37a8ccc1a4c54ab9103613b91ef3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_777f775b845b4d4dacec14420ea13f7f.pdf
    • https://static.usrfiles.com/ugd/4dd980_3935558b4130442e9e3ed2cb4bf1f9c5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/24101322724.pdf
    • https://static.usrfiles.com/ugd/b916f4_a302bf6e73fb4c8b9f71ee3c31df73a8.pdf
    • https://static.usrfiles.com/ugd/b56239_97b343d50c4a44a19ed8f49d10806d18.pdf
    • https://static.usrfiles.com/ugd/f523c3_9f5862f8a5844e2692c43b50cef043bd.pdf
    • https://static.usrfiles.com/ugd/a1fb72_ac7f602acf9145b7967b8cc32c4e72f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_053808e8de0a4b62b6f65f7f8946bbac.pdf
    • https://static.usrfiles.com/ugd/a382ee_38c5eb448ec94145b11346ed731877e1.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e40.bin
e57669161ab33501db972965eafca51d88ffa5c8742e62b62c2d27ef9ec84078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E40 5340 bytes
font_01_sfnt_off00008079.bin
63f019dff5fa66ce254f8ec0f5ebdd5c99fc9b2aefd3036a46ce71f5faddaaf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 2016 bytes
font_02_sfnt_off000089d1.bin
35fa61e14111de1996f655029612a279e78661613eaa0015071caa2caec6492c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 11124 bytes
font_03_sfnt_off0000af83.bin
38627b93cc9f370a31a933e816fb5ddadaa2d4e49c7483e22e5b965209e5b38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 16276 bytes
font_04_sfnt_off0000c4fb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 4324 bytes

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