Malicious PDF — malware analysis report

Static analysis result for SHA-256 794af9b41dd6f856…

MALICIOUS

PDF

46.1 KB Created: 2020-08-29 17:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7e9c2de375fdb4d876049a5da1bb74 SHA-1: 37272ac6bde46c1d8c9bf59c4f3cb11da9244b5f SHA-256: 794af9b41dd6f8563ac46e987eba3f8e31dd37e384e8b9e03713804b0c9c0517
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically disguised as a search result for an exercise chart. The primary malicious URL identified is ttraff.link, which is flagged as a known redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking PDF links, likely part of a SEO poisoning or link farm tactic.

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.link/wix?keyword=weider+exercise+chart+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_2b1b63a1a5464ea5ad75349c5086a720.pdf
    • https://static.usrfiles.com/ugd/c7a620_f9ba0a4b35f94f66b2d16f41e6b43538.pdf
    • https://static.usrfiles.com/ugd/b8c837_718f5aa6ad314dbf956a23250d9ff214.pdf
    • https://static.usrfiles.com/ugd/b8c837_790dd339d1a04b8fb4af639928740fc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0445731655846e8bab94c08dcb1919c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5acf3bd648bb4d3ebe36e1253e730c57.pdf
    • https://static.usrfiles.com/ugd/b8c837_f77f3978bc9f49548284d9b4015cb7ff.pdf
    • https://static.usrfiles.com/ugd/4b874d_bbc52d9bf0d541b8af4ef68caa041524.pdf
    • https://static.usrfiles.com/ugd/19103d_454cb556b71a4caa83c51806f74c0fd5.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/abide_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/analytical_reasoning_solved_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0432/6090/3582/files/fejitonusujadawuvapabi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdf.bin
f8b8607f0672a3444ffc27ee8159c686a809e3a2f866900c69dc7ed689d09800
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 5292 bytes
font_01_sfnt_off00006de8.bin
7dcc66ef811d7eb2f9b0bbdcff9bb714f83b4383616e480f96bd6fd5553052cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE8 10112 bytes
font_02_sfnt_off000090be.bin
05471825749b4cf3d705f9827a65e10f5b4f977be48e09d49adc7ac334625c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 17672 bytes