Malicious PDF — malware analysis report

Static analysis result for SHA-256 a609bb9b145034b2…

MALICIOUS

PDF

40.5 KB Created: 2020-09-15 02:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c79c10bd1a166555cb24e1e3fc95fb2 SHA-1: c33e86948d0f64427d7bf93fc1d0708e79dc387e SHA-256: a609bb9b145034b23c1fc8a7c837c193b25e27a8f2cd4bcbdc82bac7c534659f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.link/pify?keyword=kinh+tin+k%25C3%25ADnh+d%25C3%25A0i', points to known malicious redirector infrastructure. The presence of a link farm and a malicious redirector strongly suggests the document is intended to lure users to malicious websites, likely for phishing or malware delivery.

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/pify?keyword=kinh+tin+k%25C3%25ADnh+d%25C3%25A0i
    • https://static.usrfiles.com/ugd/0994f9_f3009f4bf1444f32a640d20769130ef4.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_5cb50dc0753b4cc889bbe10f3f2d8206.pdf
    • https://static.usrfiles.com/ugd/a771bd_4006512cfe6d4f9fa54714794fb07985.pdf
    • https://static.usrfiles.com/ugd/26481d_4d49db942bd0419aa260b6a8fa6f431f.pdf
    • https://static.usrfiles.com/ugd/72ed28_8e4f9ea1151b4c57b482853b77ade2e3.pdf
    • https://static.usrfiles.com/ugd/b81754_24da53465fde44f3bfd17f2a9d0c2315.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/hinge_router_template_lowes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/belling_kensington_electric_range_cooker_manual.pdf
    • https://static.usrfiles.com/ugd/d90490_4f1b7986ae64425a8d648c9bc8404fa8.pdf
    • https://static.usrfiles.com/ugd/440e29_91be4c91a9084b26aad6ae97a7fb3962.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056f1.bin
034164f9fe769ce0f77a2a0308ced78dee43889f0879e31618fcc8ae345f0979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F1 4716 bytes
font_01_sfnt_off00006700.bin
3b2e53290a18f557f722f3773f7f63c416b02cc05b28303a4ed0c7918abf4bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 20724 bytes

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