Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddc0cf2c31770d3…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9aacfa856334c2b8720d7650168f15 SHA-1: 9b02be103191f2a8a58c35dfe7abaa133a5d94c9 SHA-256: 4ddc0cf2c31770d3633e5882f0f0b9d5fe2ff1d38228ee01161ef24785aac3ea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=due+diligence+example+reports'. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=due+diligence+example+reports
    • http://dinodi.beyourradiantself.com/uploads/1/3/1/3/131398140/25bc800c2.pdf
    • http://files.asadeltanu.org/uploads/1/3/1/3/131384429/1435233.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7525/files/integer_number_line_template.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/56443342912.pdf
    • https://cdn.shopify.com/s/files/1/0438/9679/9384/files/best_bluetooth_keyboard_for_tablet_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/7581/9927/files/kezufobibulodijipijowoga.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/calendario_annuale_2020_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/zulax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9029/files/gardens_of_the_moon_character_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/38760480538.pdf
    • https://cdn.shopify.com/s/files/1/0438/8408/5416/files/69956605222.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_off00007bb4.bin
c839756a0ced4b5d6a0957788dfb5078d12938a47b189c39fcc15ba8d59bb147
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB4 5460 bytes
font_01_sfnt_off00008e2e.bin
4137d40520d2ce80c3d249055413fa67b3b7b6f5b670441a09cf084702e49cd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2E 10988 bytes