Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3dd8bb132266f6…

MALICIOUS

PDF

48.9 KB Created: 2020-10-27 10:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cbd146d74139971b5ad6ed6ae1b3217 SHA-1: 11d3ae949f12c1f04bcc62f61beb48c2610aeec4 SHA-256: 3e3dd8bb132266f6acde0d1048a691ab85f225c5b7b408502a47b9dc174e2ad7
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 of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/123?keyword=do+not+be+daunted+by+the+enormity+of+the+world%2527s+grief+print'. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains this same redirector URL, reinforcing its role in the attack.

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/123?keyword=do+not+be+daunted+by+the+enormity+of+the+world%2527s+grief+print
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f968a8b907e8.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f938703c54f2.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f872730c5cb8.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f924b33d0124.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8ab09d0ebff.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f936ba928f27.pdf
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f9594fc8f1af.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5f93a6b3ca944.pdf
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f97d9b24d4a3.pdf
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f885e1a95c66.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/botisipizuz_supixikikijowa_kabexodonu.pdf
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/zixekew.pdf
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/sodajixozegizowupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/bepabatagisevolago.pdf
    • https://s3.amazonaws.com/kakekojezutok/cara_buat_cv_di.pdf
    • https://s3.amazonaws.com/fezenur/toporogabuwetofulej.pdf
    • https://s3.amazonaws.com/bupijila/51163989905.pdf
    • https://s3.amazonaws.com/pegek/apgli_loan_application.pdf
    • https://cdn.shopify.com/s/files/1/0496/9214/7869/files/best_cleaner_app_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0498/9199/9926/files/gw2_legendary_armor_pvp_guide.pdf
    • https://s3.amazonaws.com/takateg/business_card_layout.pdf
    • https://s3.amazonaws.com/wilugugo/katalog_schneider_2017.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_off00007d0f.bin
c6a1d21170920372711a40ba494b8cc70a042e2d63d0b7f0f4c72ee635f8fd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0F 5824 bytes
font_01_sfnt_off000090d0.bin
3d2375aca7e089fa828efe119cedb9064c94b48331f07942aadc3349d23b1d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D0 10756 bytes

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