Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59094e4bbcc9405…

MALICIOUS

PDF

43.2 KB Created: 2020-08-21 09:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e6f2549e50f834ed28e7128bb4a79f SHA-1: 00c789a7359aa7e3de17a74a60eb144007129dec SHA-256: d59094e4bbcc9405b461bdae62c09dc87d95bc992457182c96aa124534fcc66b
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=fnaf+bonnie+song'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on cdn.shopify.com. The document body, though heavily obfuscated, also contains the malicious URL and other PDF links, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=fnaf+bonnie+song
    • http://files.en.oslomamma.net/uploads/1/3/1/4/131438464/8c4b6de4.pdf
    • http://files.shanikajforeside.com/uploads/1/3/0/8/130874254/mefozumivi.pdf
    • http://gazol.conniecycling.com/uploads/1/3/1/4/131454950/direwokog_zemajipo_gewilazedi.pdf
    • http://files.kriswongbarrie.com/uploads/1/3/0/8/130873708/9009782.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/circulatory_system_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/84340162386.pdf
    • https://cdn.shopify.com/s/files/1/0436/7751/5941/files/budget_planner_template_nz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/sukudaresuxenibajakulije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/21684205647.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8423/files/sijejizoresubufovaresa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/waxejexus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5865/1545/files/farit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/8042269627.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/prakasam_donakonda_weather_report.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
stream_005_off000075f0.bin
e64ac25b168d8bf436b4410c830022d77102cf9a98fe6237fe3bce58d0c1429b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x75F0 22780 bytes
font_00_sfnt_off0000475f.bin
f6477b49afc8e5629ad7ff53b7cba7e403f05fd855288132cfafcc0ea1689a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x475F 4900 bytes
font_01_sfnt_off0000582c.bin
c9d1fabc923ca3326762a9b53518c2ba08f4d58d0c0558d2d62683e60f768363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582C 8656 bytes

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