Malicious PDF — malware analysis report

Static analysis result for SHA-256 1204c1412efec496…

MALICIOUS

PDF

54.0 KB Created: 2020-07-30 21:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97fe06ae2813c9cdc2bc9c0dbe7d5c0e SHA-1: 02c2173f8f11d010449d6e95f2f32b0fb99f5c92 SHA-256: 1204c1412efec4968d19569700ce112d55fcb67be3978650ae815fb05433d2b4
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.ru'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'science book', and the presence of embedded URLs indicates an attempt to direct the user to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=10th+new+science+book+english+medium+in+pdf
    • http://files.staceywelsh.com/uploads/1/3/1/4/131406800/juxopapovewifofuve.pdf
    • http://files.unionhopebaptist.com/uploads/1/3/0/8/130813489/d18b7511b751b6.pdf
    • http://files.nathanielpicardbusky.com/uploads/1/3/1/4/131455275/260bb86a8ae098.pdf
    • http://files.unbarbadosandoecs.org/uploads/1/3/1/1/131164046/3995283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/puladavuzobadobiberipomeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/49829353294.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/sapovefonamezosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/42764056301.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/11652641260.pdf
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/11967841039.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/46873442616.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/7925105486.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/44399099015.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/zikebokebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/45788057815.pdf
    • https://cdn.shopify.com/s/files/1/0432/9062/4158/files/82670347782.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/rivisagidag.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007435.bin
1aa4615c4b041fac3150564f402ca19e72666c1a591aded77dd5c29fecfa03dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 5540 bytes
font_01_sfnt_off000086f1.bin
87f7764db3d7e96ecd7edda09a35b4fd847463af6bf261b26067fec9b6012bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 13572 bytes
font_02_sfnt_off0000a6bd.bin
2bf09719f28c40b7bbc50a6fab261ac4ae39c9437f4d5be402da3b8efc77de60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BD 10308 bytes

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