Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3ba42c2959199e…

MALICIOUS

PDF

46.3 KB Created: 2020-07-11 12:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2fdc66756697209e0e4712c7ea4adf SHA-1: e449866c2b2417b9159c2b0514cf82cb0972593d SHA-256: be3ba42c2959199e49528cd3c9694e9a6d6debf0b890f30470e79fd0820c8e52
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier strongly suggests maliciousness. The primary attack pattern involves directing users to external, potentially malicious, sites through these numerous links.

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.com/pify?keyword=kubikkfot+beregning+fra+inches
    • http://files.canaanchristianministries.com/uploads/1/3/1/4/131438234/fuluwuxigaj_jurobo_sewoje_mazexemozokobu.pdf
    • http://files.nplfiles.com/uploads/1/3/2/7/132741128/8518057.pdf
    • http://files.mitchellband.org/uploads/1/3/1/4/131453232/vusoxopisofanupan.pdf
    • http://files.lincolnleapers.com/uploads/1/3/2/6/132681903/9402417.pdf
    • http://files.tonypalermolifecoach.com/uploads/1/3/1/4/131437740/eaf0f757.pdf
    • http://files.oldfortsoap.com/uploads/1/3/2/6/132681201/fitukibuvo.pdf
    • http://files.smartgrouptoys.com/uploads/1/3/1/3/131398449/70ba71baeb7.pdf
    • http://files.sisterspiritwomensharingspirituality.org/uploads/1/3/2/8/132815154/58853863.pdf
    • http://files.jalanpipes.com/uploads/1/3/1/4/131406835/nibibudujiginitufuzo.pdf
    • http://files.cavgolf.com/uploads/1/3/0/7/130739513/mejakuzufe.pdf
    • http://files.sherieunfiltered.com/uploads/1/3/2/8/132815961/a59b4b501cc8.pdf
    • http://files.hogridin.com/uploads/1/3/1/3/131398084/wiroxaz.pdf
    • https://zavufogo.files.wordpress.com/2020/06/gamejeradufasatukunex.pdf
    • https://jisabiwofif966812601.files.wordpress.com/2020/06/wosinomizad.pdf
    • https://gebujurerine.files.wordpress.com/2020/07/tewevuman.pdf
    • https://guzedaf.files.wordpress.com/2020/07/vapid.pdf
    • https://dekosim.files.wordpress.com/2020/07/kumerimesaletufuge.pdf
    • https://fumimefo.files.wordpress.com/2020/07/53214094094.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/6729822608.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27588499931.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/64806059942.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/gobudasabomufiwoxuvifigo.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/
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/gobud

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d14.bin
34541f7708e4b515582c8a68efe903ebba62aee564cd669749b9e1c3e6af7825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 5168 bytes
font_01_sfnt_off00006ea7.bin
7e98081f44ff9be21f2be21d17426fa35b07cfbadd26ac3f6cbb691f5ce60abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 8976 bytes
font_02_sfnt_off0000806b.bin
84ecccfdeb897324c133b1152322321b48dff5a8f5d143a651af308367e4edb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 13564 bytes

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