Malicious PDF — malware analysis report

Static analysis result for SHA-256 683090149e7ab495…

MALICIOUS

PDF

47.0 KB Created: 2020-10-28 03:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f61ad47a4f37f3d61546001c39e393b9 SHA-1: 2b67e70855f6d8c018e00c39a377928c94a476e9 SHA-256: 683090149e7ab495564814764fda047c31fa0241259196030c67f5e95cce1f0d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://cctraff.ru/strik?keyword=drivers+ed+chapter+9+worksheet+answers+weebly', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating its central role in the attack. No scripts were extracted, but the heuristic firings strongly suggest malicious redirection.

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://cctraff.ru/strik?keyword=drivers+ed+chapter+9+worksheet+answers+weebly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f8cff2d58722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f8ac9374bcd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f8d758c56775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f914da02bac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f981003d36f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f8d61ebcd46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5f95af10ec7fb.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://s3.amazonaws.com/mijedusovineti/gekijuxivimapumexelojika.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/practical_english_usage_archive.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/12220425645.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/trust_deed_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/ziwubexesoruvufu.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/61942551359.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/apdcl_recruitment_2018_assam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5736/5159/files/6405822816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3998/9141/files/world_of_warcraft_warrior_guide_classic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9818/5121/files/hellforged_spartan_assault_tank_forge_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8542/5557/files/100_ounces_of_water_to_liters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0677/1356/files/liftmaster_garage_door_opener_programming_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7901/4844/files/ms-ps1-1_lesson_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6215/3382/files/batman_and_robin_comic_images.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0113/9359/files/99096146249.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_off00006a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A34 5564 bytes
SHA-256: 480a32f61f40a25fc07606da9a60bad74fd4cfdf592ac643cf1a831e0fbf6131
font_01_sfnt_off00007d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 10232 bytes
SHA-256: d53ed1de97444ac02c90bc5642e50b3274843260be4d7bb1ff37519042b70104
font_02_sfnt_off0000a02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA02C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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