Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cefd4496a15f93…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 04:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1fe6d3950234277cc6538d8930d991d SHA-1: 79398e63c139933b78590480bc2f0c265531ef26 SHA-256: c8cefd4496a15f93408a01a67454201dd3e9b4f815769133c34c5dad0c16b7b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an AWS certification roadmap. It also features a link farm of numerous other PDFs hosted on Shopify, likely to improve search engine ranking and distribute malicious links. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link-based redirection attack.

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.com/pify?keyword=aws+certification+roadmap+pdf
    • http://files.diseaseecology.org/uploads/1/3/1/4/131437378/tamojerif.pdf
    • http://files.toledoia.com/uploads/1/3/1/6/131636766/rusozidobuw.pdf
    • http://daxilab.designmyhouseplans.com/uploads/1/3/2/6/132695663/4b02d9.pdf
    • http://files.ballouhsphysics.info/uploads/1/3/1/3/131380627/futobiritesa.pdf
    • http://files.lipsnlashes.shop/uploads/1/3/1/3/131381231/1676f.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/sweet_16_programs.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/62108122065.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/82015998050.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/99495542320.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/osho_the_book_of_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0438/8628/0872/files/lakufedo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6151/7217/files/donezufaterigejom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/xewumipotubuvimovun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/kufarabitak.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/zumituzefuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/48093555819.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/25784317405.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71419102660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006228.bin
8a441b5e326e47de32c0f8afc5fd646d6515fd9cfc02663ce86b1bd54f2b84be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6228 5136 bytes
font_01_sfnt_off0000738b.bin
ef0705fb041aead1519241aec1f9b7ff70211fa8b3057afb4d75fcff8ac904bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 10004 bytes
font_02_sfnt_off000095c4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C4 4324 bytes

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