Malicious PDF — malware analysis report

Static analysis result for SHA-256 549ee07c1a99b053…

MALICIOUS

PDF

41.9 KB Created: 2020-08-28 02:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b9f207f770d96404cf227e00c07321a SHA-1: 837cf74f23fececb11560b86f3f642d208a71361 SHA-256: 549ee07c1a99b0537ef6e96cddaaa97cbc60ef98ec1dc1b3d4d06c27c60c250b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=descargar+formato+receta+estandar+sena'. The document body also contains this URL, suggesting it is the primary lure. The PDF also exhibits characteristics of a link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The overall pattern suggests a phishing attempt using a deceptive link within a PDF document.

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=descargar+formato+receta+estandar+sena
    • http://files.topshelfbonsaipots.co.uk/uploads/1/3/1/3/131380848/8483372.pdf
    • http://naxedaz.sustaininggrace.com/uploads/1/3/2/8/132814930/gazaragopupoko_fonivunobogu_jirox_fuwiwaretotix.pdf
    • http://xujonigex.mrskatiabendek.com/uploads/1/3/2/6/132680813/4a0262616edf1.pdf
    • http://files.omnigrpinc.com/uploads/1/3/1/8/131871739/4031d05.pdf
    • http://xozogon.quillviolet.com/uploads/1/3/1/4/131407493/dazetinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/libro_ventajas_de_ser_invisible.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/a_fora_o_poder_dos_anjos_da_cabala_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/82181958725.pdf
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/7625697843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/xedupatakamariguxare.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16994954809.pdf
    • https://cdn.shopify.com/s/files/1/0437/1585/4490/files/62644769001.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/gekom.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000427e.bin
849396ff24e6087e285eab21613a1e23cf443e11769e62e4d83ee1f009bc03b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x427E 5048 bytes
font_01_sfnt_off00005383.bin
550d77cf05f10becce7dbd2e213f1b726da5eaf3163dd4ce14497cf6d1127dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5383 10752 bytes
font_02_sfnt_off0000771a.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 16204 bytes
font_03_sfnt_off00008c49.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 4324 bytes

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