Malicious PDF — malware analysis report

Static analysis result for SHA-256 37befc860dba9a2c…

MALICIOUS

PDF

57.8 KB Created: 2020-09-03 02:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7af536ad7a07f6b91cfa050ea170888 SHA-1: 89512ea682a2507cc8a8cf9dc7de4463bbdb0fc0 SHA-256: 37befc860dba9a2cf22662da862b4092bfc4b8d68c27a014b30d244f56ef433c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.me/wix?keyword=meaning+bimanual+examination. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=meaning+bimanual+examination
    • https://static.usrfiles.com/ugd/a18aa6_78c18698e78f4546a11486f364909d75.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de383fdc8ff445f9343ab234c04cb5e.pdf
    • https://static.usrfiles.com/ugd/b88e3d_c01da9ac5b4946d0b96802f668c97145.pdf
    • https://static.usrfiles.com/ugd/9421c8_9db30be7242c4a849ecb02821b5f8041.pdf
    • https://static.usrfiles.com/ugd/824332_666aa6fc401f48909ee30806993e7d71.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/korijedisewigaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/70025215359.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/fallout_tale_of_two_wastelands.pdf
    • https://cdn.shopify.com/s/files/1/0432/6365/6099/files/internode_support_guides.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/laxejemapuguwenipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/21474876109.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0389/files/division_2_assault_rifle_build.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/21085821538.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/24376340902.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
stream_005_off0000b01f.bin
912b141515a0fd684915381070f05778c076ec05e688756ba6066667ad4a9461		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB01F 18152 bytes
font_00_sfnt_off00007cfd.bin
2a1459712c33ac25ae734d33de7f43c0281cf27cd8b01c374419091f8fda32d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFD 4824 bytes
font_01_sfnt_off00008d5d.bin
b39baca71b1e338f940dc8146efe861025dd62d42d611ad77c3d4eedd0aed4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5D 10112 bytes
font_03_sfnt_off0000cbdb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 4324 bytes

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