Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b03c164321e4923…

MALICIOUS

PDF

39.4 KB Created: 2020-08-20 00:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a8118e65f94b75dd604425950d15b9 SHA-1: 65bc18ee99677288836a3169c9f18f68fd142e85 SHA-256: 5b03c164321e49232a8f15756ed83238af27769a01c8adea3e4987f42120346c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The primary purpose appears to be SEO manipulation or distributing further malicious content via the redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a 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.cc/pify?keyword=logical+thinking+pdf
    • http://files.deweybookemhowe.com/uploads/1/3/0/8/130813413/kovilosofi-punifat-mavudunem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/86184024690.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/pizifevebupedazomodoma.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/administrao_da_produo_nigel_slack.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/85525984791.pdf
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/kogezegibadifogizikez.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/libby_s_pumpkin_bread_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/40223489445.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/32232817005.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/17878948120.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/10636729660.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_off00005c51.bin
3d71f2af7bd345a725c1f56c6258cb4c86da32f3bbecf8c25ad136dff7461ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C51 5148 bytes
font_01_sfnt_off00006dd7.bin
9cd41ad987ca0ec85b90edf877a9c07d6e80eaa7fac3033dd01fdbc7ab8b4260
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 10376 bytes