Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1f6ba2c91cf3a6…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 09:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd3e306204b5d80a4a4aa4cb7aff03ec SHA-1: 61f63e2b1100990f7a73aa2232bfce9e1e0f8dd2 SHA-256: 0c1f6ba2c91cf3a6fc3953e8474c978c7564f332aab113b72e4c31ec4d194eb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL and a benign-looking title, suggesting a lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a likely SEO poisoning or traffic generation scheme.

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/wix?keyword=street+art+histoire+des+arts+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/7446/1352/files/82842759936.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/nawexerejemubosesomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/gukadulawozudevibaf.pdf
    • https://static.usrfiles.com/ugd/eda9ba_3c7ddb7711eb4eaea0d3efdd4c44912c.pdf
    • https://static.usrfiles.com/ugd/3dd68e_99729551e630461fac523071ac4fcc23.pdf
    • https://static.usrfiles.com/ugd/07e02c_890754a516c8453ca4fcb688708f6db9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ff32f78a12449649dd687e530b692e7.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/joderimujuzinesar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/benim_hocam_tarih_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/volasirelimadalovolejos.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/38918193618.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/gowumog.pdf
    • https://static.usrfiles.com/ugd/33ab24_8075a1ce3e1b407080f84855207c96cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_534f01251945428bbf863bea53b52996.pdf
    • https://static.usrfiles.com/ugd/b444d4_6c948073886d4c06a2995622072ef8de.pdf
    • https://static.usrfiles.com/ugd/d1d005_69a0417aec49439381b5dc5545066267.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_off000077d0.bin
8c465f037a70a19b3842da68a74ac5078221b3ea0df9850d1f2488a1de033a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 5200 bytes
font_01_sfnt_off0000896c.bin
c87a375cf14d71509953e2199758c693a6de991bd00ff9e65fddde9f012e6658
pdf-font-stream PDF embedded font (sfnt) at offset 0x896C 11572 bytes