Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f0d91f6dc6c3c0…

MALICIOUS

PDF

43.6 KB Created: 2020-10-04 21:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 13645fcf38928ff395c9068700632a98 SHA-1: e6791215b437db9c04be69bd7514e7f83d7c7605 SHA-256: 27f0d91f6dc6c3c0d409edf71ff839a893379adb22cf0e5599498b05663cfcac
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading drivers and includes several URLs. The presence of a visual download button and the link farm heuristic indicate a strong intent to redirect users to malicious infrastructure, likely for further payload delivery.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vimicro+usb+2.0+pc+camera+venus+driver+windows+7+download In PDF document text
    • http://bafuzub.jaclynjaramillo.com/uploads/1/3/1/4/131483371/6052702.pdfIn PDF document text
    • http://files.abicernavaphoto.com/uploads/1/3/1/8/131856695/gomozo-dowefegi-ripedikaforu.pdfIn PDF document text
    • http://jarodagaz.hazencuyler.com/uploads/1/3/1/3/131380505/e07b0.pdfIn PDF document text
    • http://files.myswagbag.org/uploads/1/3/1/4/131437878/8a84fb7a8879af4.pdfIn PDF document text
    • http://fojeduger.robbieandmatthew.com/uploads/1/3/0/8/130873872/pagizedano_momanew_norogo.pdfIn PDF document text
    • https://site-1038879.mozfiles.com/files/1038879/divotoxijutunavifi.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/50720872349.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/23704291452.pdfIn PDF document text
    • https://site-1040000.mozfiles.com/files/1040000/rexata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4421df71-7e5d-42a6-a123-df0a340cd2aa/potesinufanijodoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1725f84-6a99-48c1-b92d-7cf8697d3b52/9599420858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2793/files/the_magic_book_by_rhonda_byrne.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2467/0105/files/46477068257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/kulepurijawuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6570/2565/files/essentials_of_human_anatomy_and_physiology_chapter_1_review_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 5664 bytes
SHA-256: cf5d3a01e7beea6ffb862525c011a362e5db97d732d56f09ed680458d326c7df
font_01_sfnt_off00006fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD9 10288 bytes
SHA-256: e9a27f49a5c71c1b837ab2fdfc7c988d57b755ca153df4deb59fbbfa3b7e945f
font_02_sfnt_off00009311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9311 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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