Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eaadf9a40f24c7…

MALICIOUS

PDF

60.4 KB Created: 2020-08-29 02:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab6b7387fbcb453c1f7ade6afa4e053 SHA-1: 8a898223681b37b19148416f289a2de75da35c34 SHA-256: 66eaadf9a40f24c7223d7eda87e335a8063e08ef5ee4f415533d191c18bc31e8
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for downloading content, likely to lead to malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external PDF links points to a link farm or redirection scheme.

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/wix?keyword=hindi+movie+boss+full+movie+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/best_android_phone_video_games.pdf
    • https://cdn.shopify.com/s/files/1/0440/1440/3742/files/bryant_oden_the_father_s_day_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/5748/6753/files/kit_jersey_barcelona_dls_2019.pdf
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/nulavexabebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/xojisosiseragidar.pdf
    • https://cdn.shopify.com/s/files/1/0462/5986/3706/files/vezumajamezafib.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/tally_interview_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4404/3943/files/tejabufideb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/ottoman_empire_history_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/vejovedomezorexatutufipun.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009932.bin
635b397c71c6c6d4106fe63a95ae104ab115014418c868a0a58021f7a0689463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9932 5208 bytes
font_01_sfnt_off0000aae5.bin
10ba7a13a6e12f3fc3f350fbee5ccff8d8053095040858d88234e6f6b02e01ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE5 10684 bytes
font_02_sfnt_off0000cfb4.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 16164 bytes

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