Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca88c38fc6a9dc0…

MALICIOUS

PDF

48.8 KB Created: 2020-08-26 01:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3304867b2ba1fe0b389bf5788c218a3 SHA-1: 1f5e91f62e64c834d997934c63f5306e8a3b44ab SHA-256: 4ca88c38fc6a9dc03dd2da8cbd5074b452115a9549f665dd7d8467329c2d8506
154 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, primarily through its extensive use of embedded links. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one URL points to known malicious infrastructure, specifically 'https://ttraff.ru/pify?keyword=discord+mutes+everything+bluetooth'. Additionally, the PDF_SEO_LINK_FARM heuristic fired, noting a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a potential link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector strongly suggest a malicious intent, likely to lure users to harmful content or phishing sites.

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=discord+mutes+everything+bluetooth
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdf
    • http://files.vikingstrack.com/uploads/1/3/0/7/130775603/wotobo_sosidanoti.pdf
    • http://files.mountaintownplanners.org/uploads/1/3/1/0/131070332/c7597e89ac.pdf
    • http://files.rootsthatrundeep.net/uploads/1/3/1/6/131606672/ponumibiroki.pdf
    • http://kufamo.caricaturedubai.com/uploads/1/3/0/7/130739664/kojevetofo_sawitajevono.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/51804511687.pdf
    • https://cdn.shopify.com/s/files/1/0464/5791/3512/files/62529390912.pdf
    • https://cdn.shopify.com/s/files/1/0453/2695/8747/files/watirirolaso.pdf
    • https://cdn.shopify.com/s/files/1/0461/3917/9161/files/23799749500.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8113/files/94757557326.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/99510381586.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/zafazugasilenojolubes.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_off00007194.bin
4a7bc001eb272b82199a843b54bb67c0a432570bba33f2d306f3a72a08c274be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 5444 bytes
font_01_sfnt_off000083f1.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F1 1800 bytes
font_02_sfnt_off00008c7e.bin
46df21603a6fba102aa2e5213d95781d879b123f199be7417b720c42dc5ac97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7E 12788 bytes

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