Malicious PDF — malware analysis report

Static analysis result for SHA-256 804e9d72c1a6d083…

MALICIOUS

PDF

45.4 KB Created: 2020-09-01 06:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09231054e4589779d3d43293c4281532 SHA-1: bd109de8258aa66c1e2580a0e870c9c4b075d014 SHA-256: 804e9d72c1a6d08305ca20677aebac0e725896b9519ad840cf5ff1fb0cf05a92
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits characteristics of a link farm, containing numerous embedded URLs. One prominent URL, https://ttraff.me/wix?keyword=dibujarte+revista+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify. The primary attack pattern appears to be SEO manipulation or a lure to malicious content via these links.

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.me/wix?keyword=dibujarte+revista+pdf
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/liduwotifudubijifudamokez.pdf
    • https://cdn.shopify.com/s/files/1/0461/7273/3603/files/32513185722.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/zubedifugoboxeduxizu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/fasting_blood_glucose_test_reports.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6081/files/saxefomep.pdf
    • https://static.usrfiles.com/ugd/b972d5_d0bf75c3c9c74950b46e82036d844eab.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5fbdb21f8294122bed343ea0e67c279.pdf
    • https://static.usrfiles.com/ugd/b8c837_28e3e3daad48408fa536b1a636621400.pdf
    • https://static.usrfiles.com/ugd/d5cf39_8c1bc1813d4f4c24a9c1af971ed767ca.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0168/files/all_souls_trilogy_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/19508623955.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/harry_potter_y_el_legado_maldito.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/upsc_mathematics_syllabus_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/6887/3112/files/physical_chemistry_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0465/4294/6454/files/rmit_enrolment_online_guide.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b7a.bin
923dfe593da3151ca57a8b404e3aa42c7c7e15cfff198da9110c3eee24cdb2cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5276 bytes
font_01_sfnt_off00007d83.bin
fc077bf182da1a0d6473ae6160158b70440a7841d069bbd7a74571082e3d6dca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 14032 bytes