Malicious PDF — malware analysis report

Static analysis result for SHA-256 765c67695ec8715e…

MALICIOUS

PDF

49.9 KB Created: 2020-08-04 17:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d35d05251851f39c8a35fe14cd415f SHA-1: 4fca2ed56106f5ab67132ee243c8f157e053becb SHA-256: 765c67695ec8715eae97330152900dfc067787914e6fa6fe4213e8fb937b375d
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=x27+bus+timetable+pdf', suggesting a lure to a fake timetable. The presence of a 'download button' heuristic further supports a malicious workflow, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=x27+bus+timetable+pdf
    • http://files.hightechtintplus.com/uploads/1/3/2/3/132302973/47aff28564.pdf
    • http://files.delmarvagoldens.com/uploads/1/3/0/8/130874612/b839dcbe.pdf
    • http://files.slpcounseling.com/uploads/1/3/0/8/130814056/pebimunubuki_kuxeroje.pdf
    • http://files.lavenderandslate.com/uploads/1/3/1/6/131636651/1671773.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/21977903352.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/pupokuvixododojaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/40528541011.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/37016948289.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/53109657972.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/satotasebusakanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/finufazogabuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/65192233791.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/zapelumezubipugawewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/werexugifudenuxujewoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/toeic_answer_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/kapovugeretomogeronex.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a47.bin
3edf8c73579f04b944acdb0618cf65c3efcfab5ba64b2308d19e119ce80164df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A47 5420 bytes
font_01_sfnt_off00006c9e.bin
647df1cbb7984720b0d9649e081555bf8b874dce4d580a3927de1bd3e349366e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9E 2240 bytes
font_02_sfnt_off000076b6.bin
e6402005dadf4760fe23fbf528f55fdc5e717d746bbdd65ec61def53d99a05c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 10512 bytes
font_03_sfnt_off00009ae6.bin
6eef40af276a4d555b7e1ad543f9f6d7cd59f7292d63c208002f4aa9ab9165f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE6 16308 bytes
font_04_sfnt_off0000b052.bin
1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 1736 bytes

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