Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84a00f1efcce64a…

MALICIOUS

PDF

49.0 KB Created: 2020-08-04 04:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3e35a6e2805034c0f417502bccf4a9 SHA-1: 8d20023855a2203330af805c691939f7607bad9f SHA-256: c84a00f1efcce64a3ba243df82e97e3f41d963a55fb97162f7ee4f1524b3a02f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the primary links leads to malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests that the document is designed to artificially inflate search engine rankings or distribute links to other potentially malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the link structure strongly suggests a malicious intent related to link manipulation or redirection.

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.com/pify?keyword=iso+mechanical+drawing+standards+pdf
    • http://files.eclipseoverroswell.com/uploads/1/3/0/8/130813738/zubevazuxebu.pdf
    • http://files.jeffchandlercreative.com/uploads/1/3/1/4/131453530/vosubunizifiw.pdf
    • http://files.timberwolvesmusic.com/uploads/1/3/2/8/132814050/nazujibufuxepuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/55997473846.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/46929639472.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/gipolekubusobegabojave.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/88671224614.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/ringtones_from_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/dadopax.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/85495261663.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/49985582861.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/pizuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/gemok.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/bosodibajodabedubifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/temuga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa9.bin
ff56b363d3c7a38fb5b70a307d866fcc82731b0d1a5dc17dfe75ac04ce5712e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA9 5388 bytes
font_01_sfnt_off00007ce1.bin
20e213ddaee0ad9a08d277284e29890d990db28c8f2bb5e9de45bc7ec96d84a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 13796 bytes
font_02_sfnt_off0000a851.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA851 4324 bytes

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