Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b382d8625ae891…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5ce5f083944ffc34416a22ca068d3b8 SHA-1: 0bede49417f5362e018abd3dc6b83c30d6734a40 SHA-256: 82b382d8625ae8912a3d6e11bdc3a27d4de4d0a7c5b4024c4f3afc8ac1a257a7
154 Risk Score

Malware Insights

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

The PDF document contains a link to a redirector service, which is designed to lead users to further malicious content. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious files or redirect traffic. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.ru/pify?keyword=netbeans+java+gui+pdf
    • http://files.ptcwyo.com/uploads/1/3/0/7/130739504/zenagoxosu.pdf
    • http://files.anexclub.org/uploads/1/3/0/8/130874043/2cce4.pdf
    • http://files.beneluxtekmedia.com/uploads/1/3/1/6/131606020/4925696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/zokemazazubebipibuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/1951/5557/files/13106873958.pdf
    • https://cdn.shopify.com/s/files/1/0430/3192/0794/files/socit_par_action_simplifie_dfinition.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/54252023591.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/mavefuji.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/tojewavu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/xuwezizamutikopopekul.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/71476869516.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/55851206743.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/zugijumobomejupunefuxit.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_off00006b05.bin
a9a411919317b452e240cb828693b6e22a0c0c6b0ebf1b5f9cc01f8d2199ad3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B05 5324 bytes
font_01_sfnt_off00007d4c.bin
6cfa6fc32305227cdde8fd019eee48faafc48c63ac97f203dc05471b02181226
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4C 10072 bytes