Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c38cfb9affa3d3b…

MALICIOUS

PDF

51.1 KB Created: 2020-10-27 06:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c27a1dd4500dbedf6f3973c006d18ec3 SHA-1: 2a37402c7c245da87fa49df9f8910e1c6482953a SHA-256: 4c38cfb9affa3d3ba40d2f5e200ab5e4d5a68f7f8dcef7449dd1bb198b159801
184 Risk Score

Malware Insights

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

This PDF document contains a significant number of embedded links, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=captain+sobel+funeral. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, which likely leads to malicious content.

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://cctraff.ru/123?keyword=captain+sobel+funeral In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f89cd25373f0.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/4644439.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/05209.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/lepusoz_doxuvufufebese_dasovoxulumu_texemukivuzir.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/981dae.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/javixanupudura.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/fowitedaduvim_juremidegaliraw_susadedaliwab.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/9dcf6e41-12bb-4484-bcaa-2e07e337ca6a/stihl_024_wood_boss_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e368993-6e1d-4403-85a6-bd7798fa482b/area_of_trapezium_and_parallelogram_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8167eab-16bb-450c-b479-5af6e2a14bc5/jitejenitesigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5282f3ca-c3aa-470b-8394-36a616d47d90/planes_municipales_de_desarrollo_urb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859165b7-30c7-4114-9b70-9f464182e033/lefekisivinon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9928/3363/files/xugogafaniweruv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1594/5890/files/symantec_netbackup_opscenter_administrators_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/practice_of_brahmacharya_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/common_core_standards_math_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/1962_breviary.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/61286448980.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_off00007bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFB 4940 bytes
SHA-256: 7a2285b1b0a8e8b39d67cfe2cfcdbc1688f71e39322be3ec2a2ca501991b595a
font_01_sfnt_off00008ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCC 10544 bytes
SHA-256: 8fc92ffdadf95a8af4cb7fd7138b580f2c3bf7f3453134800dc0a53f80dd297a
font_02_sfnt_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c