Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba8f37bfd4d41e9…

MALICIOUS

PDF

45.3 KB Created: 2020-10-27 05:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89a810560234c7e5244461db51afdbd7 SHA-1: d270dda6dd6935730a5795a3e0fd718db23593a0 SHA-256: cba8f37bfd4d41e96da2299a8772eebd0e825c521df44b48faeb72754f33e85a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Weebly, suggesting a link farm or SEO manipulation tactic. One prominent link is presented as a search result for 'luxpro thermostat not working' and directs to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves redirecting users to malicious content via embedded 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://cctraff.ru/strik?keyword=luxpro+thermostat+not+working In PDF document text
    • https://vonegulozezuxe.weebly.com/uploads/1/3/4/3/134371031/xidofamikopip_junasutosixefiw.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/c043d85de2.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/39bee44a2.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/80060d2e0e6.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/6061717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f95bafd2103c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8a988df170e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/gamuluxelera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5105/6804/files/keynes_hayek_nicholas_wapshott.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/29590543091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/libro_dieta_scarsdale_italiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0266/1536/files/44865515879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8552/7743/files/kujewejizeduwadunadisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4947/2159/files/texecom_premier_412_installation_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7189/6741/files/zatejosajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2916/3932/files/strengthen_wifi_signal_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/zigifu.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/brown_and_levinson_s_theory_of_politeness.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7342 5368 bytes
SHA-256: 45f6228e4fc78cd17d43ac1b624bd71d1b4099493d132786f16014e504741496
font_01_sfnt_off0000857f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857F 10164 bytes
SHA-256: c8b7dc50adfcdaec0fb1e3e5bd7200793e58a6d1500310d2f82c893aca08ec6e

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