Malicious PDF — malware analysis report

Static analysis result for SHA-256 762e798f930e11c5…

MALICIOUS

PDF

75.4 KB Created: 2020-10-27 01:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb3e6f44c7fe34635b5b39c1be20bf8 SHA-1: 9a008fd155bbbb9fcefd063c68d918b99ca722f2 SHA-256: 762e798f930e11c52cf057279db1162bb7812e5a5f70848b807f065164eb5ce6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, likely to obscure the true malicious destination.

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://ggtraff.ru/strik?keyword=le+subjonctif+exercices+%25C3%25A0+imprimer
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/zizasutixezibu.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/7323260.pdf
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f904ec3b2a7d.pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f89218d79fff.pdf
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5f94983a7e5ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0503/1329/8093/files/singstar_mic_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0495/9646/5301/files/vukumawasa.pdf
    • https://cdn.shopify.com/s/files/1/0508/3424/3749/files/jupixule.pdf
    • https://cdn.shopify.com/s/files/1/0503/8712/4411/files/puwovomudexeno.pdf
    • https://cdn.shopify.com/s/files/1/0481/3658/5379/files/royal_canin_selected_protein_dog.pdf
    • https://cdn.shopify.com/s/files/1/0486/2630/3136/files/osha_29_cfr_1910_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5462/0059/files/41743267507.pdf
    • https://cdn.shopify.com/s/files/1/0504/4125/7110/files/bixakazikukemoraxojurore.pdf
    • https://uploads.strikinglycdn.com/files/f477b427-a165-40ff-8ce2-66b82683c281/lunopivodibilajes.pdf
    • https://uploads.strikinglycdn.com/files/f151ae2f-ebff-496e-a865-851b6f761ca3/auto_repairs_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/f238491e-d097-4154-82ed-bd3c12424077/55064376752.pdf
    • https://uploads.strikinglycdn.com/files/18c3c9d5-bda0-4c88-8e02-f61d6d9e9f8b/cl_dactivation_farming_simulator_2015.pdf
    • https://uploads.strikinglycdn.com/files/0e892a75-5c4d-4c15-8cff-e5834e2a0292/99896548653.pdf
    • https://uploads.strikinglycdn.com/files/0dbc409a-7e02-4b8e-9e10-9552313ad1ba/sipopimopovexov.pdf
    • https://uploads.strikinglycdn.com/files/fbeae3a1-e3b6-4afc-a2b8-982aaffe4a83/ghost_recon_weapons_list.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb50.bin
84ca3be2d81ae841a658ba1d6fcf79321713cde926ccc72bb1b3139ad5bc407f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 5380 bytes
font_01_sfnt_off0000dd8e.bin
9620dab1ebce51ba7bf50344e2861339f734c2f1374dc54060c024654f7291bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 13524 bytes
font_02_sfnt_off00010852.bin
eb9264368943617846fa19f7508bd759697dc609702bdb489aa53a5690a7a2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16152 bytes

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