Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c71d5d865658af4…

MALICIOUS

PDF

44.6 KB Created: 2020-10-18 00:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 06e25287f94cade8c68777ec8d8b2830 SHA-1: 95469c31cbf12565f6c77797e8c6ca16ca276987 SHA-256: 5c71d5d865658af4dbea572d9c3ba22063c92390f4f0f1ce745bdf73c904ebf3
162 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 a link farm designed to manipulate search engine results. One critical finding indicates a direct link to known malicious redirector infrastructure at 'ggtraff.ru'. The presence of a visual download button further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user 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.
  • 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://ggtraff.ru/123?keyword=convert+pdf+into+kindle+format+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8759e031f0a.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wewebunovemerifabo.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/1535740.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/588597.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/8543492.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nukunuraki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25899491-8555-45a4-925f-180f6ca67c3c/73251522419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d1124d-f9cc-49e3-8bb1-d6d75016b7be/kitasovexugazuzumupamud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2847af-76cc-49da-8975-4ddb9c65d743/xugilesukafafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2ba9de-b33b-4b70-a68a-e7e1efee3ca3/19275077908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e18eb4-2f69-4885-adcf-b587ebfe954e/88609559477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d725e99-582c-4d40-952a-fe1e77d3a1af/womemubogatefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44de99f-8a93-4582-9d06-7bc341aa3169/sazagiguwowazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30719ba0-c62b-4284-873b-021ce099db6c/61470867579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fbf915-f1ee-4ddf-a0fb-69127af74299/oxford_yaynlar_ingilizce_hikaye_kitaplar_stage_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab125bd2-c4f2-47cc-8b07-c9d8165afbba/50242528844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f754a34b-3f20-4b5a-ba23-0cace6b4f93e/70009891808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5b4b62-9195-4aa9-b4a5-061af229f344/24782152818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3126df-b91c-4753-9286-4a3e4bf511fb/nafodiwutidezavemoxutevov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c9380c-d834-44a5-93fa-d7dbc37c2eeb/30991920017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eca7c49-fb5b-495f-ab59-c0c7f8e4d26b/9276146763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3c42fb-d055-4628-b739-95188639923a/fezikumum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faecb1c2-38fd-4378-9c48-dbdf0ee71e8a/sepokokadawekesaguzaj.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_off00006ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 5040 bytes
SHA-256: 43db0254b6e197ba68c6d1d1db6c7ca1b50460737a1232b8ba853fa95023faa4
font_01_sfnt_off0000810a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810A 10556 bytes
SHA-256: 512fb36e198a6ed438c6d89448e8343dcacbee07398aee849ae508a31dac786f