Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f74bfee72546d6e…

MALICIOUS

PDF

54.2 KB Created: 2020-08-24 01:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d956f3b5dcd41570ec0f27a33557b5fa SHA-1: 295b22bd4a69dc4159f6ac04baaa4eda332a5875 SHA-256: 6f74bfee72546d6e39a037381ea9817f6f7855c4bdfa7eb333e98c77917f58bb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a harmful site, likely for phishing or malware distribution.

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=lactogenesis+1+y+2+pdf
    • http://files.gearussell.net/uploads/1/3/0/8/130874254/rovejobeboru.pdf
    • http://files.metaphorboutique.com/uploads/1/3/1/4/131454883/4846898.pdf
    • http://buxitisow.stmaryslibrary.org/uploads/1/3/0/8/130813714/wotakatanosaze.pdf
    • http://files.leopardpineapple.com/uploads/1/3/1/1/131163617/3840108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/human_chromosome_structure.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/addition_and_subtraction_of_fractions_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/roxovipanevasiv.pdf
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/cerberus_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/81944625114.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/git_remote_show_origin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/86725219962.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/28063089453.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0349/files/vevefixafejeweko.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/47555572347.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/english_grade_10_textbook_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000741d.bin
cdcfd28419c2bbf1f959ab3ccb287a05560b683e1b1a4ff113c6617858866c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 5212 bytes
font_01_sfnt_off000085fc.bin
58b1b82615175053faffce4175b17bcd6cc031755277e1585783a34ccba8fa2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FC 10052 bytes
font_02_sfnt_off0000a892.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA892 16148 bytes
font_03_sfnt_off0000bd8b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 4324 bytes

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