Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9a9a8794a6f42…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 02:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362011db9a082df9ff6c9c1b1085a0dd SHA-1: 4160d7808d9812c05c2e3d84f031ba56445a6564 SHA-256: 6bb9a9a8794a6f420a88ca259823f7ea973be628e4bd22737c3e8f7bb6c091b3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=halliday%252C+fundamentals+of+physics%252C+10e', suggesting a lure related to a physics textbook. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a potential link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the ML classifier strongly indicates malicious intent.

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.com/wix?keyword=halliday%252C+fundamentals+of+physics%252C+10e
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_04ba36cb25b14989b3ddd3fe3d2cb6fb.pdf
    • https://static.usrfiles.com/ugd/e1c37d_0ca7b387a5564a02a0ed753231e0dd84.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b935660bb4b41b0a56ed5f44f4834f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1816ed7f36b240ccacc5e447da034b88.pdf
    • https://static.usrfiles.com/ugd/b8c837_146b08c34cde469494a55c87ba4bcac1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6962/7799/files/buzusesobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1067/7141/files/78289504094.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/diferena_entre_capitalismo_socialismo_e_comunismo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/86135339484.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/c._f._l_ka_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/mcgraw_hill_connect_economics_answers.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_b95bda3dd3ce44d18b6e0d2d563a7ca5.pdf
    • https://static.usrfiles.com/ugd/a382ee_033b227774724349a457595cb7837ce0.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d3afd4c4fe5444d6a1372cb9c1f0b454.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004abe.bin
37dfb43a7b3cca3899467d9262bfe9c1755006c547708906e0446ca7a51edcfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABE 5612 bytes
font_01_sfnt_off00005dc2.bin
04580d333ab458333b9399af565362c8777c3ff1f9f6101f6da7c8c7dc2a303e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC2 9868 bytes

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