Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36b798bb5fcb654…

MALICIOUS

PDF

66.4 KB Created: 2020-09-30 20:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 820e8d2c571f729f1457bd623ef43f49 SHA-1: e0c59461924fbeaa480b901c0a12b06a678590c5 SHA-256: a36b798bb5fcb654c353eab344593cc03d4984f25cd3403b449d4bf6efe0fd65
154 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many of which point to PDF files hosted on domains commonly associated with SEO link farms. One prominent link, 'https://ggtraff.ru/strik?keyword=hindi+typing+chart+pdf+hd', is flagged as a malicious redirector. This suggests the document is part of a campaign to drive traffic to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/strik?keyword=hindi+typing+chart+pdf+hd In PDF document text
    • http://files.upstagingdesign.com/uploads/1/3/1/3/131380183/1f23a3ba2624897.pdfIn PDF document text
    • http://files.artistscoalitionforevents.com/uploads/1/3/1/4/131407901/pejafi.pdfIn PDF document text
    • http://files.oddityodysseys.com/uploads/1/3/0/7/130775731/1848573.pdfIn PDF document text
    • http://demul.forgecraftsteelfabricators.co.uk/uploads/1/3/1/4/131483152/natutipa.pdfIn PDF document text
    • http://files.johnachten.com/uploads/1/3/2/6/132695517/a156ed9728f646.pdfIn PDF document text
    • http://files.murphymedicalwriting.com/uploads/1/3/0/8/130873838/fevewili-rumujez-batex.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/14191406489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/fexeworusofanisisizin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/difference_between_active_and_passive_fire_protection.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/pdf_english_phonetics_and_phonology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7803/9190/files/tarage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/1695/8630/files/33792270807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/41710814539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0600/9242/files/blink_camera_black_friday_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/tegurare.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5B 1712 bytes
SHA-256: b90d2108136ac8bae53c7bfd85ccbe7d58672a489cf05862534aa67e23a96d77
font_01_sfnt_off000073a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A5 4828 bytes
SHA-256: cf41941b7decb7e6a5dd7a6a334b39ea62a790ff60f3039ada988843173ce87a
font_02_sfnt_off000083fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FB 3772 bytes
SHA-256: 4cd60777e265fafd80a6c4ac8a8f541642313e2b1c6670a3899fdf55b12f51bc
font_03_sfnt_off00008fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA0 15768 bytes
SHA-256: 0ff7c3aad5af5846631f8dbe613b0a3ba35257eb72d4e345461372540d0c1a0c
font_04_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_05_sfnt_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 10056 bytes
SHA-256: b89558c8cc3ee962e0dd9f35a6460f75c3b3e89210614d368e3b9ec7e835bf8d
font_06_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 6196 bytes
SHA-256: 3cdd1a769d4d730043496b197ef39ea183ec3f79ae46a0a8bb448c89b47fa8e2

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