Malicious PDF — malware analysis report

Static analysis result for SHA-256 709c4dbf40b06f69…

MALICIOUS

PDF

57.7 KB Created: 2020-08-24 20:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e95d7ea69d5b9c639b4c98314a555d SHA-1: 1013f724306bb351bff918cf3a9c1e3f5981807a SHA-256: 709c4dbf40b06f692cc115d1a7a944b87d018f8adc144281479b9c1a60e87841
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify, which is flagged as a PDF link farm. One of these links, https://ttraff.com/pify?keyword=cooper+cf+3000+software, is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=cooper+cf+3000+software
    • http://files.educateachildinpakistan.org/uploads/1/3/1/4/131437677/pumeneseki_muwol_fipezewebugam.pdf
    • http://files.buckeyehollowchurch.com/uploads/1/3/1/3/131398498/5718410.pdf
    • http://files.globaltransgroup.com/uploads/1/3/1/4/131438641/7fba4d9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/better_than_carrots_and_sticks.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0133/files/45531841459.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/tilijisemupadezomupux.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4105/files/sugasorapuvasaluwigiluj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/arduino_bluetooth_controller_android_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/free_printable_colouring_sheets_for_christmas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/12709034961.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/appropriate_preposition_list_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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092e5.bin
0fa6c88a8fe01a711456934781ead47daaf8dcbd043b89faf79d1a6abd7020ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x92E5 5032 bytes
font_01_sfnt_off0000a41e.bin
db3d3b699cb087997a6b5530b85e535d4368c622ec3b234666229d2136e84282
pdf-font-stream PDF embedded font (sfnt) at offset 0xA41E 11668 bytes
font_02_sfnt_off0000cbd2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 4324 bytes