Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdc0df98d7d6943…

MALICIOUS

PDF

38.0 KB Created: 2020-09-29 11:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af8dd31020ff064c51cfc4d903eab90 SHA-1: 34f1880947ebe0ade4c54f98b649541dabaef4b2 SHA-256: ccdc0df98d7d6943467eee35835514811f0a44519c2b42ab9b836a98e8d24aa5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm for SEO manipulation or to distribute malicious content. One critical heuristic firing identified a link to a known malicious redirector infrastructure at `https://cctraff.ru/mozel?keyword=centrifugal+pump+troubleshooting+guide+pdf`. The document body, though heavily obfuscated, also contains this URL and other suspicious URLs, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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://cctraff.ru/mozel?keyword=centrifugal+pump+troubleshooting+guide+pdf
    • http://files.eagleyoungmarines.org/uploads/1/3/2/7/132710661/vupotosaxidig.pdf
    • http://pipone.baaff.org/uploads/1/3/0/8/130874493/1938dba4.pdf
    • http://files.legacygift-shop.com/uploads/1/3/0/7/130740017/d4097a1bb0f2.pdf
    • http://gebaze.glenholtcommunitymarket.co.uk/uploads/1/3/1/8/131871650/ranededikizawubi.pdf
    • http://files.adoreddoodles.com/uploads/1/3/0/9/130968913/besibudapu.pdf
    • http://minawoxi.quixotecommunities.org/uploads/1/3/1/1/131163943/koxajoru.pdf
    • http://lenas.rochesterelementaryband.com/uploads/1/3/1/6/131636734/xiresudenawukevus.pdf
    • http://files.emmamaitland.com/uploads/1/3/1/3/131384145/2242754.pdf
    • http://miwidid.thewritingdragon.com/uploads/1/3/0/7/130775413/xumegexekemog-jubipe.pdf
    • https://site-1036995.mozfiles.com/files/1036995/50081748863.pdf
    • https://site-1036719.mozfiles.com/files/1036719/57975710929.pdf
    • https://site-1036982.mozfiles.com/files/1036982/33026906069.pdf
    • https://site-1037176.mozfiles.com/files/1037176/2289520500.pdf
    • https://site-1036772.mozfiles.com/files/1036772/loxutujuwowaruvitiluvep.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/fetipojidazob.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/41642107742.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056df.bin
4373ee6d5ddff924ecd27a83991210a6bf1326979247be0ace2f163f7d4419f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56DF 5500 bytes
font_01_sfnt_off00006961.bin
bfc696ca58c01f0efdac054aa17a4dd05886b2726547da1cbabac1c1afd30415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6961 9908 bytes

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