Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb3b6d0496977b…

MALICIOUS

PDF

39.4 KB Created: 2020-09-07 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2be01e8fc06f9532a84839ef9532107e SHA-1: 213b2d9e01bf464a7c351f15b399c0fbb91b7d25 SHA-256: 90bb3b6d0496977bf00b5b10ac6b20ffe6757866b1b20f98d473a03214271db3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Comeback jonas brothers piano sheet music'. This link, 'https://ttraff.club/wix?keyword=comeback+jonas+brothers+piano+sheet+music', is the primary indicator of malicious intent. The document also functions as a link farm, embedding numerous external PDF links, many hosted on Shopify, likely to obscure the malicious redirector and potentially for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=comeback+jonas+brothers+piano+sheet+music
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/senosatunozubebonanenazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/96160618501.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/a_letter_to_momo_subtitle_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/90669112336.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/1754053966.pdf
    • https://static.usrfiles.com/ugd/d01287_3959fdc4d7c84951ac3c1de8866c6915.pdf
    • https://static.usrfiles.com/ugd/ea78e0_2819cbbed1b642fa819010d57412c2b5.pdf
    • https://static.usrfiles.com/ugd/0a593f_83547a8f408142a8ae2f7ffccdea669c.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_b1d3c8329f3f4eada3919c78210d039b.pdf
    • https://static.usrfiles.com/ugd/0b1cf2_2af5411125c6439286bdc2439a1fec14.pdf
    • https://static.usrfiles.com/ugd/30e015_bfc083e0973746b582c0138371bf6a7e.pdf
    • https://static.usrfiles.com/ugd/694d5d_fb2b8228d0874adb8b4dab51d66e6588.pdf
    • https://static.usrfiles.com/ugd/3fc21f_5d8f2360de974f69a83caff631f1bf50.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/pesuzuvizetimonokidufugel.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/89090047913.pdf
    • https://cdn.shopify.com/s/files/1/0434/4161/9100/files/68737082137.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e94.bin
fd4a05ab0dcd7a792ced1aa3250caa2821001a576b23aafab122d4f649fd34c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E94 5324 bytes
font_01_sfnt_off0000607d.bin
8c76f79566dcc4fb9c346952376e6ee86be64dc51d6a3e3292884117aa9b7151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607D 9896 bytes
font_02_sfnt_off00008265.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 4324 bytes

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