Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22f8e274310ed83…

MALICIOUS

PDF

51.6 KB Created: 2020-08-29 07:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33e96984d3b1479a107c2f045a24cf4 SHA-1: f2ddbb9894ef4233acc26441b5e70cf475ed0dee SHA-256: f22f8e274310ed8355f3ce03f57a3e6f2050892521c8159d473fee49ea1aae0e
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=frozen+2+piano+sheet+music+pdf, which is also present in the heuristics. This URL is likely used to lure victims with a seemingly innocuous search result, leading them to malicious content.

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=frozen+2+piano+sheet+music+pdf
    • https://static.usrfiles.com/ugd/b8c837_434b0b7edf3a4f50a66ee6efdd1fdb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5a2aee70f5c422ba252edaf7453e7c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_86f05555b2954559b33e9eb856273b24.pdf
    • https://static.usrfiles.com/ugd/b8c837_d078420971214a67ad774ede501d4b52.pdf
    • https://static.usrfiles.com/ugd/b8c837_230c1e8b6a9d45e997fbecb745af5ea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c697ec0dbf941909e71a5d6ce3b7c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_189392cf04394947a07e7239f084b154.pdf
    • https://static.usrfiles.com/ugd/b8c837_35ee4f7454d942fb811e6e65be8bb538.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c3b4a09b150486b86f05f462cf4778d.pdf
    • https://static.usrfiles.com/ugd/b8c837_274da813579f432e9db73af3b685073c.pdf
    • https://static.usrfiles.com/ugd/b8c837_627bd5e6270a411586a7054f928fac01.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa681a238eb041a29ed0c89168d03d14.pdf
    • https://static.usrfiles.com/ugd/b8c837_119944b4b5ee4258828b5250fe89c084.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/how_to_convert_google_play_book_into.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/xifujusama.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_off00005ac2.bin
d1fffeb230bbd7f12caf69367277c775e217bbc1a12d2f7e8c4cfd08ec7ac628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 5384 bytes
font_01_sfnt_off00006cdc.bin
e56e031f835ce21ee9fd0cbd31fff1fea6c46fc56a2b18a1855be215571da8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 14748 bytes
font_02_sfnt_off00009bc2.bin
abc7328ccf549b8c44af1f64d7c984da4fbe29dc3574f2049195a8aca4184ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC2 16964 bytes
font_03_sfnt_off0000b335.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 4324 bytes

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