Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a17827eb67f5bb0…

MALICIOUS

PDF

55.7 KB Created: 2020-08-30 14:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 955b03f634d25a9f9fbfa33105b99e21 SHA-1: 6a8f5f577b02151f044beadf5e1974f1cd4d2ddc SHA-256: 7a17827eb67f5bb0665299570599704513c24d7e9abdef38f681cac23bff63d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.cc/wix?keyword=data+structures+in+python+pdf. The document body, though obfuscated, contains references to the lure text and the redirector URL. The presence of numerous external PDF links suggests a SEO poisoning or link farm tactic to distribute 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=data+structures+in+python+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/2c608b_c04ca8653dcc4aaba09c118adb2ec215.pdf
    • https://static.usrfiles.com/ugd/253000_fa124d8159e64e5aaa8273c386ece02d.pdf
    • https://static.usrfiles.com/ugd/455f95_528a6aa85c9341b7b74c7ab5b90637a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1e15348104e4cf1a43f89dd17fac07f.pdf
    • https://static.usrfiles.com/ugd/b8c837_68d82d63751d4673a654b89ed94a7141.pdf
    • https://static.usrfiles.com/ugd/c3f88d_b610c17ed96545db97ba82987a09e024.pdf
    • https://static.usrfiles.com/ugd/b8c837_74e3707b6826426d9c56d050c3e0849f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f57224e68724d1e9728378571be4fcc.pdf
    • https://static.usrfiles.com/ugd/dad90e_3f9055c228ac43a8b52c658def29bd27.pdf
    • https://cdn.shopify.com/s/files/1/0430/3041/3475/files/vitagujumosidudejijixuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/64764723202.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/gaketifisugej.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/benim_hocam_cografya_soru_bankasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/mosonitodiwowubamewe.pdf
    • https://cdn.shopify.com/s/files/1/0464/2347/4328/files/benefits_of_school_uniforms_essay.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/fosafutevikibalu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008376.bin
aa87042a81c7cb97d8030d8458d526541df0d5226e041b1f659db6295dd658f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8376 5196 bytes
font_01_sfnt_off0000951f.bin
212cec284edaa048b98b7feb84965f5f739ddc2d0727b7c4f0ee0ca19e7ddc27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x951F 14524 bytes
font_02_sfnt_off0000c342.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 4324 bytes

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