Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7bcc2df09c5e05…

MALICIOUS

PDF

44.2 KB Created: 2020-10-25 10:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77d0910e34047f5d58f7639eb1e82fc6 SHA-1: 2d1b78b64d18473245e23223d5056fe4a7da948a SHA-256: 8a7bcc2df09c5e05f5ea02e201f8b6cbba9432c5deaae04d48b3ed8db854ef9c
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to external PDF files hosted on file-sharing services, suggesting a link farm or SEO spam operation. One prominent link redirects to a known malicious infrastructure, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=spot+welding+fixture+design+pdf
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/1475870.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/wikibegodebu.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/jobud-kajixo.pdf
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/6fbee1.pdf
    • https://ronesafoko.weebly.com/uploads/1/3/4/3/134312324/aec9687497.pdf
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f919dd6497ee.pdf
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f9487c4a1d1f.pdf
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f91fe6571ab4.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8759771aa92.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f8ce8a356da1.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f8c3dc8acbad.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f91571c946bd.pdf
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f87bafa708db.pdf
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5f951122a35ee.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8863f2ad7cf.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f8efb78dd8c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/xikufifoxuzolatopobosetop.pdf
    • https://cdn.shopify.com/s/files/1/0503/1536/2489/files/23948213653.pdf
    • https://cdn.shopify.com/s/files/1/0268/7411/8325/files/pan_asian_food_menu.pdf
    • https://uploads.strikinglycdn.com/files/99ea3a28-9a73-4444-8e80-ab75e1f1e82b/masterbuilt_pro_dual_fuel_smoker_manual.pdf
    • https://uploads.strikinglycdn.com/files/1ff2c9ad-10ca-43fb-b083-547b5487cef0/zakuxazovufor.pdf
    • https://uploads.strikinglycdn.com/files/08de26d4-0cfb-43d0-930b-c2206c511fcb/93320532360.pdf
    • https://uploads.strikinglycdn.com/files/a815ae5e-1264-403b-bb66-0f61cba14d55/my_dog_is_limping_front_leg.pdf
    • https://uploads.strikinglycdn.com/files/abc35df0-7e68-4d6c-969e-c4db9a58a754/37218893617.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e3.bin
831f0e968681256866222726aee4339b1eaca978f409bddc5278689c137c8233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E3 5260 bytes
font_01_sfnt_off00006bf8.bin
1f3bd839d632230c079fc5715b049b99bd6618a9713e581829e23044267122ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 10008 bytes
font_02_sfnt_off00008e7d.bin
e378496ff4b4329e9698dc62510b77aa20d6148e4879fbbc576c593c8f820d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7D 16060 bytes

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