Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5096faf1783105…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 22:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e277f132d9679bd0d1b5c40bc34b46e1 SHA-1: cfccae46a0883a944e67300aac1a8fec68c4d2fa SHA-256: cd5096faf1783105f872bfcadbab66dcf25d7a70e7ec3222c46cbd76594d42c1
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Astrology answers horoscope leo' and the malicious URL, suggesting a lure to trick users into clicking on the links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=astrology+answers+horoscope+leo
    • http://nawarito.manchestertrees.com/uploads/1/3/1/0/131070588/toxigufax_zojeduta.pdf
    • http://files.trulyhealthyworld.com/uploads/1/3/1/3/131379615/zupimakofe.pdf
    • http://files.haccc.org/uploads/1/3/1/6/131637239/9179558c7.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/nikig.pdf
    • https://cdn.shopify.com/s/files/1/0450/7166/3256/files/18912390139.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/50698808784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/72852554369.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/dikisaramuguva.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/27669121213.pdf
    • https://cdn.shopify.com/s/files/1/0429/1821/5846/files/93075345560.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_off00006294.bin
5aab2c6397a643ddcf48d4799d0f6cae5e477c9fcb2e18e2e080b299ee631862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6294 5380 bytes
font_01_sfnt_off000074ea.bin
80f96854c174d48ea822dd450cedb9ce1dc481ff5892cf3ead25244480cc5ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 10256 bytes

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