Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af5f0e7d82054ac…

MALICIOUS

PDF

32.8 KB Created: 2020-08-18 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6262cf90a81c69f2202013b586580ed SHA-1: 5e41f9c64f9b8b2f5087844618bae2f4adee1ffd SHA-256: 1af5f0e7d82054acd6917053c641f4a4f8b734d0fbc0a99244f1dfc58b30ff33
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as academic resources, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though malformed, contains the malicious URL and references to academic materials, supporting the lure.

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=advanced+financial+accounting+11th+edition+solutions+manual
    • http://files.thetotalcanine.net/uploads/1/3/2/7/132740541/9545830.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/28964606301.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/management_information_systems_14th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/wiboxexetudapedetub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/zozugive.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/nanofubugajalaxetinefop.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/nudovararal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/borderlands_athena_skill_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/musetudijuwolafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/fuzavorakidenefumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2593/files/xajororuzotetidowuwekise.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/gavipiperavu.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_off00004419.bin
c299c3c2a7beb8fa6d7778907b605fe2a6987547adfb90796bea413ff836201f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4419 5440 bytes
font_01_sfnt_off0000567e.bin
b06213c384522d6dad7a724d5f6e80dc79e53fd9abc014a3ce24381438b26a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567E 9328 bytes

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