Malicious PDF — malware analysis report

Static analysis result for SHA-256 673976f146792c9c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 01:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0bfc44f51f67b62cc8a309eb1d38d7 SHA-1: 060b9f79939ce32050e727932bd2735284b0338b SHA-256: 673976f146792c9c76dcbed3dca5c2a8aa6dc7d19ed932ef4a53e141f4358c8e
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate sheet music, but it redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to direct users to harmful content. No scripts were extracted, but the PDF structure itself is used to host and obscure malicious links.

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=st+louis+blues+sheet+music+pdf
    • http://files.hazeltones.com/uploads/1/3/1/3/131383333/60863af0.pdf
    • http://files.victoryfitnesstimmins.com/uploads/1/3/0/7/130775427/nefup.pdf
    • http://xuwiz.westsidetrackclub.org/uploads/1/3/1/3/131380005/2cdcae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/72112868322.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/97291101244.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/kimilige.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/nenisofevaxinakefuxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/43249183987.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/30846400946.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/advanced_language_practice_michael_vince_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/simumapojolefosuwolises.pdf
    • https://cdn.shopify.com/s/files/1/0440/7086/2998/files/10385357069.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/54622939849.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/56323220429.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2982/files/30866705827.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_off0000657e.bin
caa91a24bc4789cdf98082c2cedd36f06d438c7aba7443acfe45f0d6ee5c8048
pdf-font-stream PDF embedded font (sfnt) at offset 0x657E 5332 bytes
font_01_sfnt_off0000777b.bin
cce845c651a155dd04e35a90b7121921e38194eaca8e1453da54d7e6a5557527
pdf-font-stream PDF embedded font (sfnt) at offset 0x777B 14940 bytes