Malicious PDF — malware analysis report

Static analysis result for SHA-256 242be5f42c1c6080…

MALICIOUS

PDF

42.6 KB Created: 2020-10-26 17:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a95b1067f2fbc7e64c03bc39b4e42aa SHA-1: 1acf5195a19de45f0ef75313a701473c12b6602b SHA-256: 242be5f42c1c60800454e608061811a653578f213ca19ca70befe3d1cedea2b3
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One prominent link, https://gettraff.ru/strik?keyword=harvest+moon+magical+melody+gwen, points to known malicious redirector infrastructure. The file also exhibits characteristics of a PDF SEO link farm, with a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a network of linked documents. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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://gettraff.ru/strik?keyword=harvest+moon+magical+melody+gwen
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f92b6c9014a6.pdf
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5f8e86481bdf1.pdf
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8bcd25887c4.pdf
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f87a8609835d.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f94f679dc454.pdf
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f965219426a3.pdf
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f9170fc6359e.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f917807a8ba1.pdf
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f907d6daaa01.pdf
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f94ea0b43ff3.pdf
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/4967574.pdf
    • https://zeronifoza.weebly.com/uploads/1/3/4/3/134312515/vaduguzomuvo_dipuzajoze.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/595d1631d7e3.pdf
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/682315cffc67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/muragivuse.pdf
    • https://cdn.shopify.com/s/files/1/0479/9433/9481/files/88736493221.pdf
    • https://s3.amazonaws.com/kopisigapub/planilla_tarjeta_de_credito_banesco.pdf
    • https://s3.amazonaws.com/dadupawo/wetivuvatoripixavu.pdf
    • https://cdn.shopify.com/s/files/1/0484/8851/3691/files/mastering_blockchain.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/joshua_tree_airport_shuttle.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/witchery_mod_para_minecraft_1.12_2.pdf
    • https://cdn.shopify.com/s/files/1/0266/9314/0675/files/arithmetic_progression_formula_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0484/5725/3018/files/kobikavawefepuro.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_off00005b12.bin
af0afa0be1d3c16d558f39c6beb1b9f880cbba61ffa7a813a8a3c8587438cbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B12 3200 bytes
font_01_sfnt_off00006684.bin
f1e057888a65eb2d1b5ffac26579dbf219addcc8357501122de70e74d9ab65a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5472 bytes
font_02_sfnt_off0000791d.bin
9dee71de504620a8352b16e4349a6e8601a1e3c60847554cc79f7a556d3dadd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 10388 bytes

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