Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7546768eee06d0d…

MALICIOUS

PDF

52.9 KB Created: 2020-10-26 02:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2668977dad5870fae711cc8b92ae3e27 SHA-1: 770f9d9e1c1c8b773be8a4289ae8bcde0ab80cb5 SHA-256: b7546768eee06d0d3d3ae910fc60d1c49bf0228d6a62504ec975cd741e19eb7a
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure (ttraff.ru). The presence of a 'download button' heuristic and the ML classifier's high confidence score further indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting it's part of a lure to redirect users to potentially harmful 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/123?keyword=sakshi+telugu+news+paper+pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/pomazevenuso.pdf
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/da9914f54891.pdf
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/lewixax-difisevar.pdf
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/8f881.pdf
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/tiruxutigidofibigiw.pdf
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/tawodesovugemoz_zebum_nejipujopud_videbonemidune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0484/4627/5752/files/john_grisham_the_innocent_man.pdf
    • https://cdn.shopify.com/s/files/1/0500/0314/8955/files/kopovip.pdf
    • https://cdn.shopify.com/s/files/1/0484/1871/7864/files/tibagogokaje.pdf
    • https://cdn.shopify.com/s/files/1/0268/8247/4181/files/mini_stereo_system_with_cd_player.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/57108293965.pdf
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/plosives_fricatives_sibilants.pdf
    • https://uploads.strikinglycdn.com/files/3e64342d-40c5-4cfb-92ea-df5efb0a2842/mis_sentimientos_erroneos_resea.pdf
    • https://uploads.strikinglycdn.com/files/e3018c0d-ff1e-4ef9-8e4e-a87d81085e13/fetefibirazamenowanud.pdf
    • https://uploads.strikinglycdn.com/files/298d076c-188b-42db-acf6-1e332dda67d1/97404504407.pdf
    • https://uploads.strikinglycdn.com/files/78229c5a-6261-4799-8822-a5fb13ef9cda/4051923578.pdf
    • https://s3.amazonaws.com/zetare/performance_appraisal_ppt.pdf
    • https://s3.amazonaws.com/salosibejodod/2138461105.pdf
    • https://s3.amazonaws.com/kavitokolezub/segurana_e_auditoria_em_sistemas_de_informao.pdf
    • https://s3.amazonaws.com/tadovu/dukekifoxojulena.pdf
    • https://s3.amazonaws.com/zonivezada/koxutapamuwiramakig.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_off000067dd.bin
8f540a021667e35b6e52eddd5f8a095031277ad66c163f0b6d7518fcc7b34921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DD 5560 bytes
font_01_sfnt_off00007ac0.bin
7e8e989cd51fe9bfcf2e7d1d556359d40cd11ab11827e9aac9746da566cf05e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 15368 bytes
font_02_sfnt_off0000a1cc.bin
7e04a2d6917bf69fd4ff0938b19f3bf1e31e47cc62951d93c10220990624b276		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CC 10972 bytes

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