Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5eb53cd391240a…

MALICIOUS

PDF

46.4 KB Created: 2020-11-02 20:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0cb7e181f7c20cf422ebba40af56f39e SHA-1: 7711c3b8e331374630bfcf5db856f88066ec074d SHA-256: bc5eb53cd391240a8ba44c5d7a91e1c29d2f3551ae7ab67c67ceaac411c16354
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=bim+application+in+construction', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a tactic to drive traffic to malicious sites. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirector and link farm strategy.

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=bim+application+in+construction In PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/rixep-wusila-fumisabimajavaz-xatexozufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f9d5fb246f8a.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/8135243.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5471a811b.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/dojagamugofowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6842/2819/files/the_warrior_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/0206/0703/files/ramogagesatuvevovinijuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0261/4683/files/lupikaboxufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/27039380774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/aktualisasi_nilai_nilai_pancasila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd49acb9-16b4-4fd3-af70-7ac7e12ec50f/56955225411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9245/2523/files/37895637926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b471cb1a-a505-4bcd-a2a8-28d5d4208aee/xotojizedovofugakotuki.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/98465744470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0276/2658/files/bifagejofe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A97 4892 bytes
SHA-256: e0e70feb1286ad5a219d0eb89cae5a0f315b0fcb7449db66752e30b9ab322a65
font_01_sfnt_off00007b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B05 10452 bytes
SHA-256: 84ed21dc3793a654c9f5f4528df9d4daea258e7d246f43efc345db27a7ee5f55
font_02_sfnt_off00009ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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