Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e43dcc216df049…

MALICIOUS

PDF

57.4 KB Created: 2020-08-28 09:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8c699b3977db5e5cf9aa8b4979fb83 SHA-1: f8a5ecb088933e42c1df4e6ea2c301fd9254cadb SHA-256: d5e43dcc216df049e550960f81f67c28ba1b34c5a57770a62e0c583606f27ea9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, a PDF SEO link farm heuristic indicates the document is designed to host numerous external links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to this malicious site.

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.cc/pify?keyword=joseph+john+thomson+atome
    • http://files.artistsalive.org/uploads/1/3/1/4/131482821/fotuxiw_midapaw.pdf
    • http://files.artistsalive.org/uploads/1/3/1/4/131482821/
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/redspot_a_level_physics.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/bukhari_sharif_islamic_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/2020_calendar_tamil_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/47270781200.pdf
    • https://cdn.shopify.com/s/files/1/0457/7217/7564/files/invoice_generator_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6344/2598/files/watizobani.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2038/files/mojajijuralozasexakesad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6407/files/dj_rap_mix_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/lusakawubitiwakifidop.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_off0000a4b0.bin
b87427eb060049384b51bb982d39c96155045af00a09339a388202e129a45390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B0 4996 bytes
font_01_sfnt_off0000b58a.bin
0e1b2c0c3064b2d42ba2b57b8d0f13cb3648fe9ea4df79b8c0a4a27436eb0613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 10416 bytes

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