Malicious PDF — malware analysis report

Static analysis result for SHA-256 090af6da12357117…

MALICIOUS

PDF

77.2 KB Created: 2020-10-06 12:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e122ffcc7e73b804b47c5a65c2255dfb SHA-1: a649937f29b1d34aaa5af5bc71bed454fe5dc78d SHA-256: 090af6da12357117721319783f4059160061e855f897ea28972e90506bd43d2a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://gettraff.ru/strik?keyword=black+hole+theory+by+stephen+hawking+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

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=black+hole+theory+by+stephen+hawking+pdf In PDF document text
    • http://tarotez.theharbordivide.com/uploads/1/3/1/6/131606523/memiwezemedoduzifuso.pdfIn PDF document text
    • http://daxabuvul.chefpaulbarron.com/uploads/1/3/0/7/130740189/lotibolope_kumuregimoroj_zuzufajofojif.pdfIn PDF document text
    • http://files.bect-services.com/uploads/1/3/1/4/131453094/474ca4a70f1.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/mowevota.pdfIn PDF document text
    • https://site-1043939.mozfiles.com/files/1043939/28301214991.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/38874347886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5924eca-575d-429c-be74-d6b065c7fd9e/zaxulufegixeregomudozet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8798/9398/files/68428654673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6573/2003/files/dezamijezuxumukilamid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/fema_rv_trailers_for_sale_in_texas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0601/7692/files/52028278373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/kawhi_leonard_fantasy_trade.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 5864 bytes
SHA-256: b7626df3d018dd2155b3b008876373ad2dd0c2b9f31c33878913eaa68dba13b0
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11112 bytes
SHA-256: 2c708aaeb17f343fee5bd60ae8aab20215d1c76259ef8e82a0a47e88a45633ba
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16688 bytes
SHA-256: 07e753f6bf0943268a8572f37ed42b9296fc7da7730dc1953a0c4c1af078a140

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