Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e4d1d351d2c123…

MALICIOUS

PDF

51.7 KB Created: 2020-10-30 03:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b8c6c9fc2a820dc7c83139600170d713 SHA-1: df1a958f0cf5aa1a12558be41098b037b8e7a437 SHA-256: e9e4d1d351d2c123a654dbaffbc95f388b3b46155e62e573cc348d178479f25e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host phishing content. Specifically, one URL is associated with a Netflix credential phishing lure, directing users to a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/wodelag_kulewifos_detoketupap.pdf.
  • 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://gettraff.ru/strik?keyword=free+netflix+account+info In PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/wodelag_kulewifos_detoketupap.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/3738725.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/ec4945.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/8488884.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/935a4dc2771f97b.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.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/1/0502/1604/2655/files/potato_osmosis_lab_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2618/4349/files/94958062904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6122/0793/files/alchemia_story_fighter_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4991/5845/files/collective_nouns_things_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/elementary_and_middle_school_mathematics_teaching_developmentally_10th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/repilakatetidikiwat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4951/5684/files/44251092310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9602/4261/files/traumatic_brain_injury_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/2743687597.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000759f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 4720 bytes
SHA-256: 90b3e8563fdb811c5f1972c9e91a492d92abb523ddeba9417449d1acbc86ab4d
font_01_sfnt_off000085c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C2 11220 bytes
SHA-256: a60f8f6db933c2924f265bd4c3922747687180e31308f9fbaeb121efa9614379
font_02_sfnt_off0000ac20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC20 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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