Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd45ac5985c3a0c…

MALICIOUS

PDF

50.4 KB Created: 2020-10-31 15:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 59448a7dd009dbfc318c244ec68c8207 SHA-1: c0fb58b87922b74b232bb3da43ea5069ce16ee46 SHA-256: ecd45ac5985c3a0c83aebebc2ee8b48241c855eda66d74dc1f6dd58fd6ea7f68
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to installation manuals and includes the malicious URL, suggesting a lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of malicious intent.

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/123?keyword=nest+t+stat+installation+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f9639d20f373.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/c36226d4-e579-4b41-9819-47387f7b57e7/bayer_advanced_tree_and_shrub_concentrate.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/hill_climbing_algorithm_python_code.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/bivamaxatapelowumaxamo.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/boiling_point_of_different_liquids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3361/0408/files/cody_regional_health.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8001/3725/files/golds_gym_xrs20_weight_bench_dimensions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5168/2454/files/contemporary_world_history_ncert_arjun_dev.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/65450146387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8950247-fea4-4974-89d7-78f987c24099/86510894452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291a1557-993e-4201-a4e8-4460621147eb/fifomof.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/2020_qld_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/bamokepid.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_off0000861b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861B 4704 bytes
SHA-256: bb70fe475acdc24827be098e1a50e2749b86a758041f240a98f9c25075cc715b
font_01_sfnt_off0000960a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960A 11576 bytes
SHA-256: 8cef1b0a2d0606dad5779adb435a1bb79919477df149226323ac10802e0780b1

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