Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad100003d8bc4c01…

MALICIOUS

PDF

55.3 KB Created: 2020-08-21 19:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1524f10adefd5d00b1bf60a105535f9 SHA-1: 0394128c19bc05fc476591b405d6b16d403bb6e1 SHA-256: ad100003d8bc4c01cf6adfeda3dab1a78c6b019e5bd3899a3df135fe4defcb15
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=advisory+committee+on+human+radiation+experiments+pdf', points to a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malware through a large number of seemingly legitimate but ultimately malicious links.

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=advisory+committee+on+human+radiation+experiments+pdf
    • http://files.centromedicolatinomonroe.com/uploads/1/3/1/6/131606069/vasowe.pdf
    • http://kixawevot.vrm365.com/uploads/1/3/2/6/132681670/8417874.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/detixinaroxuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/ancient_egypt_silverman.pdf
    • https://cdn.shopify.com/s/files/1/0433/9089/4247/files/nfl_bettors_guide_week_5_2019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/c_file_b_ngc.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/viwure.pdf
    • https://cdn.shopify.com/s/files/1/0435/5070/3779/files/karnataka_calendar_2020_with_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/lixorujeniviralojo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8776/files/73146096174.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_off00009928.bin
61b77761316e106943b0826306c0bcebbbb7ed6144131db9c9ca0ec40db0d640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9928 5584 bytes
font_01_sfnt_off0000ac08.bin
6d260cef6d278ebb69fd7dc7d3a0b16e83ecc0fcf0d3fad7f938363d8a1a708d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC08 10792 bytes

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