Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4a8f0348d91806…

MALICIOUS

PDF

95.4 KB Created: 2020-10-30 21:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98369e9574488596e50f7a64531bb5af SHA-1: 72f84405473b6adb3a0db6a0a9918c2b3d0405c9 SHA-256: dc4a8f0348d91806ba43662393e5beb9e04aa927d729881d1a450a88b0464755
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, directing users to external resources. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?keyword=portal+knights+coal'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine rankings or distribute further malicious content.

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/aws?keyword=portal+knights+coal In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bijojabolopeme.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/550162d5.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/nosufage-temoxuwizijiruk-velinal.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/1/0482/2977/7565/files/bahamut_lagoon_feeding_dragon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43403851-6a49-4852-8431-2801160ae77f/gorugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/lededupusip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3348/3204/files/we_could_happen_ukulele_fingerstyle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0038/5695/files/download_youtube_videos_free_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f6f707-32c3-4ac5-a888-dfb4af6afae8/dolovasadotivoxukinisuja.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/advertising_objectives.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8077/0237/files/zusofebijabewuralujilaget.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3841/5269/files/65065366440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3544/9238/files/15953222267.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 5128 bytes
SHA-256: 4cf8e240cd2ab1a5fcc2419291a09d160bc5dafde8b281b75ab1022b18011432
font_01_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 11760 bytes
SHA-256: ec830932608067c70b5e29b2a2ebb49b6bf30dffe1612c82ad7659396bb783d0
font_03_sfnt_off000159d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D7 16720 bytes
SHA-256: 70cf34eb9662109d285bb7592f68e3989661e40d56d34fd0fee9e2bb7704517a

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