Malicious PDF — malware analysis report

Static analysis result for SHA-256 6539ef629e9bb0d0…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 07:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef197f733ac45799dcfe09e4bc59f278 SHA-1: cd9d6b73c84c1e3688f2d0156c93f0c3cc9268d8 SHA-256: 6539ef629e9bb0d0436ecf91961e38f63b2a863d4e0e8cc8bdc22ea199582ac8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The document also functions as a link farm, embedding numerous external PDF links, likely for SEO manipulation or to obscure the malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users.

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/wix?keyword=belkzen+hold+of+the+orc+hordes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/89c6ad_ed58a91af69b49cf90599e84b53c23d5.pdf
    • https://static.usrfiles.com/ugd/ddb60a_1d5ff82c988f40fca3914bcfbf6a9537.pdf
    • https://static.usrfiles.com/ugd/c7a620_1b2d1478861044bb9751327740465083.pdf
    • https://cdn.shopify.com/s/files/1/0437/4262/5953/files/yahoo_finance_data_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/important_days_for_bank_exams.pdf
    • https://cdn.shopify.com/s/files/1/0439/3808/7070/files/37059151705.pdf
    • https://cdn.shopify.com/s/files/1/0437/5219/4202/files/quantitative_aptitude_solving_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/42171744779.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/xobizapejadewum.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/34955425391.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/8688828537.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2988/files/92108879004.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_off00005ecb.bin
8572223d4d746e9a3b22e5e1832d3a7cdea27da147758229f65725a66bdbc165
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 4936 bytes
font_01_sfnt_off00006f99.bin
13be4ca685a43f30422341997b59ca6d2bc36259ed61dbfcf63e2ba6a7425eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 10044 bytes
font_02_sfnt_off000091ec.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x91EC 4324 bytes