Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cb9efb9a443a82…

MALICIOUS

PDF

52.6 KB Created: 2020-08-08 09:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86e035a69a41c8a2994ed5bb6b29a1a2 SHA-1: 5588889fec51ac39cc1d6b04c5dad3a6e62a5294 SHA-256: 15cb9efb9a443a829602bbbd2b3af94e42383841fc66faeca9701bf744dd8ebb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically "https://ttraff.cc/pify?keyword=venn+diagram+caselet+di+pdf". The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the sheer volume of links and the presence of a known malicious redirector strongly indicate a malicious intent.

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.cc/pify?keyword=venn+diagram+caselet+di+pdf
    • http://fegerenoz.sophiehirsh.com/uploads/1/3/0/8/130813528/8456210.pdf
    • http://files.norcrosstrack.com/uploads/1/3/2/7/132710704/3242583.pdf
    • http://files.reseeworks.com/uploads/1/3/0/7/130739891/banirowirexuzolis.pdf
    • http://files.ambassadorsofnature.com/uploads/1/3/2/3/132302718/5731939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/vivaldi_winter_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/teori_agenda_setting_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9966/files/5059194238.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/abc_chemistry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/64623418282.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/farmakokinetik_antasida.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/management_organizational_behaviour_mullins.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/bogimidop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3091/files/house_allotment_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/lawawotugag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/7905045798.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007edc.bin
cb0ab84af283c4c1880b6a2419ede7a0c78bf876dee3d2606b2484af2c39f072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDC 5440 bytes
font_01_sfnt_off00009151.bin
362d1d70c8053ca760446a63d4db405207ea894620695efb263923eb792842e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9151 10892 bytes
font_02_sfnt_off0000b68f.bin
5205d74226710131c9b9d2333742b120c2975ad0231432a3efcf11e4ba68c1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 3804 bytes

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