Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2246a29d544c1…

MALICIOUS

PDF

56.2 KB Created: 2020-10-26 13:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e83666c6e034fcaef17eb9dfeff559 SHA-1: d338f54885105902de81512e4763bdf22c62392c SHA-256: bcd2246a29d544c108a9633f2b4f947502e11967079786978ebea7049cbb316f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure. The presence of multiple Weebly links suggests a link farm or SEO spam campaign.

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=heraldry+symbols+and+meanings+pdf
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/zevozeso-zafonemujisud.pdf
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/8172765.pdf
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/vufevexapigenupuz.pdf
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f95f805c8609.pdf
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f9273ed0cd43.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f91f1365ad79.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f88de9fa761c.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8c2a6254922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01c5e654-af5f-480e-8d61-9019c14e6389/nirosedes.pdf
    • https://s3.amazonaws.com/jamokaroxoj/viputifogatowamarudubof.pdf
    • https://s3.amazonaws.com/bawalidamovidud/numbers_in_english_grammar.pdf
    • https://s3.amazonaws.com/jamokaroxoj/19724406060.pdf
    • https://cdn.shopify.com/s/files/1/0478/9082/5382/files/tetra_fish_types_uk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1918/9915/files/fiu_dual_enrollment_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/live_sports_tv_app_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0480/9316/7779/files/bu_bhopal_new_time_table_2020.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_off00009ed7.bin
aeb02a3a52c1ae8281fa9346621cb286e07166a17a6eeeec71c53e8c666fe1e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED7 5564 bytes
font_01_sfnt_off0000b1ac.bin
162725f881508f26e9f610dcb5cac1eabd5b1552e69610ef538958d85da21ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 10188 bytes