Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c458904f841f0b…

MALICIOUS

PDF

40.5 KB Created: 2020-08-11 04:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5b4a7dbf89d1f42909e4e68b207b5bd SHA-1: 48e9bc33395233c7118b5a2cca6088c94a8b3a0f SHA-256: 72c458904f841f0bbdf741d090c64efc102382adfd845cd2ab30272f1cc654d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. These elements suggest an attempt to lure users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.com/wb?keyword=mixed%20model%20assembly%20line%20balancing%20pdf
    • http://files.plaincommunitychurch.com/uploads/1/3/1/1/131164462/05d9d999b48ea82.pdf
    • http://files.skagitcohousing.org/uploads/1/3/1/4/131407089/e3da2f50f.pdf
    • http://vazewuke.fsjcaledoniaclassic.com/uploads/1/3/1/3/131398222/buvidebevogumatunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6055/7984/files/agatha_christie_and_then_there_was_none.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/bulk_delete_twitter_likes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/rujorosutijikari.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/woxesudebivazowazedafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/the_history_of_america_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/26890101873.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/92858163188.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/dymo_labelmanager_160_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/vetaxokasusekatov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/kesonatajewolud.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/building_community_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/nokenutazirodufebulezul.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/77996850096.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_off00005f76.bin
4692df9a5682978acca44b8f1c75823c5e0bc1ef767ccdd6bbbfe656cfc2f9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F76 5696 bytes
font_01_sfnt_off000072da.bin
30b2e60e752f1b9190fc03b156c49b626e66f3addbf9e130568baf95cdc6ac07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 9980 bytes

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