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) First seen: 2020-09-24
MD5: ca2fdc66756697209e0e4712c7ea4adf SHA-1: e449866c2b2417b9159c2b0514cf82cb0972593d SHA-256: be3ba42c2959199e49528cd3c9694e9a6d6debf0b890f30470e79fd0820c8e52
184 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.canaanchristianministries.com/uploads/1/3/1/4/131438234/fuluwuxigaj_jurobo_sewoje_mazexemozokobu.pdfIn PDF document text
    • http://files.nplfiles.com/uploads/1/3/2/7/132741128/8518057.pdfIn PDF document text
    • http://files.mitchellband.org/uploads/1/3/1/4/131453232/vusoxopisofanupan.pdfIn PDF document text
    • http://files.lincolnleapers.com/uploads/1/3/2/6/132681903/9402417.pdfIn PDF document text
    • http://files.tonypalermolifecoach.com/uploads/1/3/1/4/131437740/eaf0f757.pdfIn PDF document text
    • http://files.oldfortsoap.com/uploads/1/3/2/6/132681201/fitukibuvo.pdfIn PDF document text
    • http://files.smartgrouptoys.com/uploads/1/3/1/3/131398449/70ba71baeb7.pdfIn PDF document text
    • http://files.sisterspiritwomensharingspirituality.org/uploads/1/3/2/8/132815154/58853863.pdfIn PDF document text
    • http://files.jalanpipes.com/uploads/1/3/1/4/131406835/nibibudujiginitufuzo.pdfIn PDF document text
    • http://files.cavgolf.com/uploads/1/3/0/7/130739513/mejakuzufe.pdfIn PDF document text
    • http://files.sherieunfiltered.com/uploads/1/3/2/8/132815961/a59b4b501cc8.pdfIn PDF document text
    • http://files.hogridin.com/uploads/1/3/1/3/131398084/wiroxaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://zavufogo.files.wordpress.com/2020/06/gamejeradufasatukunex.pdfIn PDF document text
    • https://jisabiwofif966812601.files.wordpress.com/2020/06/wosinomizad.pdfIn PDF document text
    • https://gebujurerine.files.wordpress.com/2020/07/tewevuman.pdfIn PDF document text
    • https://guzedaf.files.wordpress.com/2020/07/vapid.pdfIn PDF document text
    • https://dekosim.files.wordpress.com/2020/07/kumerimesaletufuge.pdfIn PDF document text
    • https://fumimefo.files.wordpress.com/2020/07/53214094094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/6729822608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27588499931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/64806059942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/gobudasabomufiwoxuvifigo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 5168 bytes
SHA-256: 34541f7708e4b515582c8a68efe903ebba62aee564cd669749b9e1c3e6af7825
font_01_sfnt_off00006ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 8976 bytes
SHA-256: 7e98081f44ff9be21f2be21d17426fa35b07cfbadd26ac3f6cbb691f5ce60abc
font_02_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 13564 bytes
SHA-256: 84ecccfdeb897324c133b1152322321b48dff5a8f5d143a651af308367e4edb7