Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e837b85cb7c94cf…

MALICIOUS

PDF

39.2 KB Created: 2020-08-01 19:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afd01a7d434361260e8fcdf9ff1204da SHA-1: 36724f39647961a71a3f2bf0b21bbb203cc9fae2 SHA-256: 7e837b85cb7c94cf97a9a55a8b48df4448641f8a8e52a5dd22b8b76b8d7a579b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=current+time+pst', which is likely used to funnel victims to further malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.ru/pify?keyword=current+time+pst In PDF document text
    • http://files.stcloudchurchofgod.com/uploads/1/3/1/3/131378838/xewegesixufesog_zuduxukuzali_potuj.pdfIn PDF document text
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdfIn PDF document text
    • http://files.creirlanda.com/uploads/1/3/0/8/130813866/58a879bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/45676679254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/59554924718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/42640543714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/89618544363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/36354865850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/31336174504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/dinexafozawefisegenezawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/kigudonotoxovexomuvineb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1203/7540/files/muwikitalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/sijivomanexex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/gurabetapa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 4628 bytes
SHA-256: e63dc4f69d1be3f0bdae257f5edfa5e8e5c89acb793722810fe85d7586036f14
font_01_sfnt_off00006d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0B 10188 bytes
SHA-256: cc2ba94e04ff9909db4cbcf54afaa349bad4eb95079c743b04c54569167120b7

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