Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4f9d0920d997b8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 04:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce9927fd3744f4eaa46235964e6157c SHA-1: b870d4085e69b627ced3c3f75abbd5f6fc74f8cb SHA-256: 3e4f9d0920d997b80300392b835e871d12fe53b7693d9ab88103f16bb2410e5f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm strategy. One of the embedded URLs, https://ttraff.ru/pify?keyword=tatalaksana+bronkitis+pada+anak+pdf, is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains references to the same URLs, suggesting a coordinated effort to distribute malicious content or manipulate search engine results.

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=tatalaksana+bronkitis+pada+anak+pdf
    • http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdf
    • http://files.matthewgrose.co.uk/uploads/1/3/1/3/131397987/c5373565b457b.pdf
    • http://zutajere.girlranawayshop.com/uploads/1/3/2/6/132683459/41596.pdf
    • http://files.droptailgateband.com/uploads/1/3/0/7/130776728/7139164.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/woods_belly_mower.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/angular_2_template_driven_form_custom_validation.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/97093062894.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9778/files/cosmic_ray_physics.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/net_compact_freamework.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/waxawefapinozumiv.pdf
    • https://cdn.shopify.com/s/files/1/0445/1853/9423/files/bosquejos_para_pastores.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/durimopeguvelum.pdf
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/hacked_clicker_heros.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/rokopate.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/4024372217.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1482/files/twilight_princess_heart_pieces.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640f.bin
5ae969fabe3e98fb9db0ee9904a8854c02e3a93618f2c0fc9a0e346cf2aa6306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640F 5188 bytes
font_01_sfnt_off000075b4.bin
7228a219e0a8859cf1b3c1cfa6aea2f956f7ec848c83d8bab14db50e6b5d162d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 10156 bytes

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