Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f4f3f4b0c6566c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce3bfddafe65d4a913f94772be8c6630 SHA-1: 161f1ba0a69408fc7f9b6a1c77301182ec52f072 SHA-256: 45f4f3f4b0c6566ca0546788a652a5371081dcab03b83956ae4b9c56d1819040
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

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 ttraff.ru, which is used in conjunction with a keyword suggesting a lure for educational or informational content. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=texas%20motto%20worksheet
    • http://leluxeg.randynissen.net/uploads/1/3/1/4/131438008/4e4456c85c20ab.pdf
    • http://pisip.lionheadeat.com/uploads/1/3/2/7/132740541/luser_fiwalewibidene_dojuwifajege_nafapalivojawe.pdf
    • http://files.stunningsphynxkitten.com/uploads/1/3/1/8/131872269/fisuxases-joregixog-xaxetasirimo-peger.pdf
    • http://files.thestrengthandconditioningcollective.com/uploads/1/3/1/1/131163945/kebinebarupij.pdf
    • http://dedumexaj.lollipopsisters.com/uploads/1/3/2/8/132815028/golub-benugofivodip-baxivawem.pdf
    • http://files.stunningsphynxkitten.co
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/korean_grammar_rules.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/business_administration_and_management_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/gauge_theories_in_particle_physics.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/daxazizajumesetad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/titedilujevovutegonuza.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/87354599948.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/gonemoleziretezixafeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/91679596039.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/razunubuxulutobes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/72427081557.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/senesimubewosutuduxapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/zosipokupijewobupulezizow.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/call_flooder_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/dispositivos_de_almacenamiento_de_datos.pdf
    • https://cdn.shopify.com/s/files/1/0449/6500/3423/files/30750690996.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_off00006804.bin
6a26b880419d359488456b3da346979b9c757898cc0bbdbb73404f283db4447d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 5068 bytes
font_01_sfnt_off0000792f.bin
f0ba9795797f88063d7a26e05acf0f43f9724f429e36577c76f6b72271275e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10916 bytes

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