Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc16ebd70225332…

MALICIOUS

PDF

39.9 KB Created: 2020-08-26 16:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc66aa0cbab982cd4b6ef35442fad38d SHA-1: e85e7c31c033b1224fe8992fbafbd1e5d887158e SHA-256: 7cc16ebd7022533221ae90143b2d1cd3b52c68870b5da23ec4f1735caece45e3
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 suspicious domains or redirectors, indicating a link farm or phishing attempt. The primary link directs users to a redirector disguised as a search result for sheet music, likely leading to a malicious payload or phishing page. The ML classifier strongly flagged this PDF as malicious.

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=gravity+sara+bareilles+sheet+music+f
    • http://files.esthersgardenofhealing.com/uploads/1/3/0/8/130814056/tamobinajubor-xetulafase-dasurisirigi.pdf
    • http://files.bluesystem.ca/uploads/1/3/0/9/130969545/3e22de5ead4.pdf
    • http://files.mikemarrone.com/uploads/1/3/2/7/132740253/4be074b15fb.pdf
    • http://moniwoxi.girltechnician.com/uploads/1/3/0/7/130740414/valuwiju.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/university_of_texas_austin_map.pdf
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/rs_aggarwal_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/check_if_object_is_empty_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0445/6284/1759/files/body_language_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/halogenos_propiedades.pdf
    • https://cdn.shopify.com/s/files/1/0448/2406/8258/files/blood_test_types_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4347/files/52552784375.pdf
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/fekugax.pdf
    • https://cdn.shopify.com/s/files/1/0437/1398/6714/files/granny_smith_v1._3._5_mod_apk.pdf
    • https://musescore.com/static/musescore/scoredata,jso
    • 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_off000050d7.bin
d21fc7b1771854501cb274aec2a28c05369dcc641dd62018442361044baa28f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x50D7 5452 bytes
font_01_sfnt_off00006353.bin
4eb35cff04e95155c7b919efd86c109957774ad862d1ac3f85505558149a2612
pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 15296 bytes