Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d03a485bdc909e…

MALICIOUS

PDF

121.5 KB Created: 2020-08-29 14:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec7669ab880cff1c2e0efa727e4dd976 SHA-1: 632e51fc6e33629574d035b7df00095c4bc86b58 SHA-256: 22d03a485bdc909ea8b484a96720846309248c30687b3c2b2f4547f6fee20d6e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL designed to lure users into downloading further content. The document body, though heavily obfuscated, contains the target URL, suggesting a social engineering pretext related to finding answers for a textbook. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the primary URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=minna+no+nihongo+1+mondai+answers+pdf
    • https://static.usrfiles.com/ugd/b8c837_fb4dc01cd1204fba8ef562004b161247.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f59dcc6f09e496f9b992b449d9a0371.pdf
    • https://static.usrfiles.com/ugd/b8c837_43cabd81d54c4facb12ee260030d307f.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/7961295343.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/guitar_chords_book_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/tefojesevufirokawenu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81b9089030945d886ddd7c35c0b34d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://static.usrfiles.com/ugd/67e251_3b152941a08d4597bcf283d981e4d455.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb275e7da9c0471490bf517e1f9ab0d3.pdf
    • https://static.usrfiles.com/ugd/66c878_e66fe649a0c6463ea586d791a27f4526.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c23bbcad5fd420c9bd99cf0bb1640e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9464c5a347c4eaf88625084b4a2eb7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3eed76385524d2680b120440fff8d88.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_off000147eb.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 6744 bytes
font_01_sfnt_off000158a2.bin
83e3342a19feacb7c49c7dc10c8204a8f2d5cd50db40a4fcb82eefc3d055a57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158A2 10412 bytes
font_02_sfnt_off00017b5e.bin
ab9303f09e3f69ab3b191b26ac5f3add5d7c7205783257b40fdea2645d278e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B5E 5280 bytes
font_03_sfnt_off00018d34.bin
c260db01221616d96224d9fb7caf967b67e341b069f1b2f03bd10ab8d0c83c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D34 19628 bytes
font_04_sfnt_off0001c9db.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9DB 4324 bytes

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