Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e03b107f49f769…

MALICIOUS

PDF

72.7 KB Created: 2020-08-21 14:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169df5d1dfc6b7a05d8cdaed5aec86d4 SHA-1: 03ac2fa0ba98a33f42910b0258684980a77b3330 SHA-256: c8e03b107f49f7695565c9dfef89269acd4dc06593dd21f7ffe76e46091c3cda
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=reporters+without+borders+singapore', indicating a likely attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/pify?keyword=reporters+without+borders+singapore
    • http://zedoze.ucfootball.co.nz/uploads/1/3/2/6/132681927/buvipenorabifutin.pdf
    • http://files.samantharicchiuti.com/uploads/1/3/1/1/131164048/1349300.pdf
    • http://files.melonilab.org/uploads/1/3/1/4/131409309/dagezeja.pdf
    • http://muwumosan.lovelepink.com/uploads/1/3/1/4/131410007/54e1ccfd140e2e.pdf
    • http://files.midvalelincolnpto.org/uploads/1/3/1/4/131482808/xeruginegel-tavaz.pdf
    • https://cdn.shopify.com/s/files/1/0448/1862/8765/files/ammerland_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/fuzaruv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/tijinesor.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/nusalasote.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/wivebe.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/nejov.pdf
    • https://cdn.shopify.com/s/files/1/0438/4866/3200/files/25189573463.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/minecraft_skin_editor_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/abdominal_massage_for_constipation.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/ragedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/pawogeloz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/wordly_wise_book_7_lesson_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/6111/6064/files/converter_to_kindle_format_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9df.bin
0193c5c66da104de5168f83d1d2c3ad9431c911da8fbbc15b69745f38f0436bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 3036 bytes
font_01_sfnt_off0000d4a9.bin
16d332c423ea30582116a235b9f1a896e17318d693d52f1424d1003928cb0fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5428 bytes
font_02_sfnt_off0000e721.bin
c4ad83f9e24a99122ddf95598fbb3fb2d4c7ab4a50541842196504b35df4fd42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 14628 bytes

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