Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c695b6c45fc2b6…

MALICIOUS

PDF

40.0 KB Created: 2020-10-08 13:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a12725133a7a1185cdbce6493c26847 SHA-1: bc1231f32c01772ebd557ace0d1f55c3b1856d3b SHA-256: 88c695b6c45fc2b600e5d88ca4d0495f83ba91eb3fda6eb318c67802c84080bb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. 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://gettraff.ru/strik?keyword=prefixes+and+suffixes+exercises+multiple+choice In PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/towisitudevilepa.pdfIn PDF document text
    • https://site-1040006.mozfiles.com/files/1040006/xewuguxofojenoxuj.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/fivegodefagafikibigotev.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/19286915301.pdfIn PDF document text
    • http://mabopib.alicekelseylewis.net/uploads/1/3/1/3/131384401/5918040.pdfIn PDF document text
    • http://files.ginandbeerit.org/uploads/1/3/0/7/130775821/48a7f19aebd.pdfIn PDF document text
    • http://files.wilbrahamprimary.com/uploads/1/3/2/7/132710491/busemekaki.pdfIn PDF document text
    • http://files.cottageglenglimpses.com/uploads/1/3/1/8/131857199/bofetamoroti.pdfIn PDF document text
    • http://files.bc-ipse.org/uploads/1/3/1/0/131069890/4948774.pdfIn PDF document text
    • http://vuwixoti.nelspruitlighthouse.org/uploads/1/3/1/3/131398493/088104a19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8111/1968/files/l484_pill_identification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/ferrari_kit_car_fiero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4447/3494/files/best_race_for_blood_hunter_dnd_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8077/7373/files/lesemabize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0343/2088/files/moleskin_for_blisters_walgreens.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 5464 bytes
SHA-256: 3d0b11d8d623de8534c46d1b53de632bcd26586f865c52674882004122980475
font_01_sfnt_off00006eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 10600 bytes
SHA-256: 9491dccf88c6b3bf126c5463518134dc9e7c76450a31f10cde8307f8cb699142

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