Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6bb37997326caa…

MALICIOUS

PDF

84.6 KB Created: 2020-09-18 05:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ccf670d23a37ee799711d4e3a4a20c SHA-1: 9dbecdb0338bb662ea1e897c6d44621060eca56a SHA-256: 1c6bb37997326caa834c9c5843a919856afd67b98eb2b5fb2826be7af0b3ba72
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious due to the presence of a link to a known malicious redirector. The document also contains a large number of external PDF links, characteristic of a link farm, which is often used for SEO poisoning or to distribute malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific content or intent beyond the malicious link.

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.club/wix?keyword=wow+death+knight+rp+guide
    • http://files.engineeringk12mass.org/uploads/1/3/0/7/130738620/8254156.pdf
    • http://jalax.kioloamarinerescue.com/uploads/1/3/1/3/131383721/2992981.pdf
    • http://gejunedej.bcwawomen.com/uploads/1/3/0/8/130873826/wufetefifodow.pdf
    • http://files.sgrhopixi.org/uploads/1/3/1/1/131164152/7043758.pdf
    • http://metalitu.doberunkennel.com/uploads/1/3/2/6/132681164/bijolawarapir_paripugadazur_pojoxixotipare.pdf
    • https://d5c356c8-d7ca-4d95-85fc-660205f2e9e9.filesusr.com/ugd/f8de3e_cf6284d09ccf4d4fb8a505494d3019c1.pdf?index=true
    • https://e70002f2-c59a-4d15-9a24-ffc6d859274d.filesusr.com/ugd/1c8c1e_2013e59a66b44bbfa74320c627572b2b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/0168/3865/files/xubuposekur.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/plastic_waste_management_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/kagulex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5333/files/falixelovobonanub.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/histrias_e_sonhos_lima_barreto.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/freeshop_qr_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/security_risk_in_cloud_computing.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104a.bin
19c9a3de29b2a9a4fb0029c33d4b175bd8a708fc52fa5d59f3c3d19636b586c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 5180 bytes
font_01_sfnt_off00012200.bin
67e0729ca3ebcd9f89dd8ef47e19acb16a25a25ef85ed9ec1edccc09d04fd222
pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 10352 bytes