Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce5874721d3840a…

MALICIOUS

PDF

42.9 KB Created: 2020-08-04 17:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375d325cf8d4f6c997c741027c8bd751 SHA-1: 04b82a35939f8601778f4b9229b126b762b371b6 SHA-256: 6ce5874721d3840a5e1883b4df0f7f0a9fcb505daac8a0721c3016788fc8c6e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector, which is a common tactic for distributing malware or phishing pages. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=bangla+book+pdf+class+11, suggesting a lure to download content.

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=bangla+book+pdf+class+11
    • http://files.cranespiepantry.com/uploads/1/3/2/8/132814096/bitepamokuga_wozaxemi.pdf
    • http://files.davisdeckandfence.com/uploads/1/3/0/7/130739475/4155213.pdf
    • http://files.supermariosurfski.com/uploads/1/3/1/4/131410818/nizaxutinanasap_xunakemodazujoj_lomoledotafegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/rexedovopunivisuzobudumuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/darape.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/54682543083.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/93674478853.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/63910285348.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/6057294230.pdf
    • https://cdn.shopify.com/s/files/1/0433/7487/0689/files/report_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/4778/8450/files/vasezunifonaxiladuxol.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/91461670814.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/68275939181.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/line_breaks_in_markdown.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c1f.bin
6ce1daa2ec4851f63591090b58dbf75d28e9fff852acd30349449c42a05f142a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1F 5076 bytes
font_01_sfnt_off00006d6b.bin
dae2f09f5b9ea95153a330c9cabe2f8191f527a4f81a1292cf8c2d2345851c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6B 10324 bytes
font_02_sfnt_off000090c5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C5 4324 bytes

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