Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1116139ca04a360…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77280d2430968f7decb4b7779078614 SHA-1: e7758982df38ffa3eabb5dc972b20690c43ec99e SHA-256: b1116139ca04a3600ed80cd8f4cc03933ef8d9c61f8ff73240f1cb04285d0f12
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern appears to be a link farm designed to redirect users to malicious content or to 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=%25D1%2585%25D0%25B8%25D0%25BC%25D0%25B8%25D1%258F+9+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D1%2580%25D1%2583%25D0%25B4%25D0%25B7%25D0%25B8%25D1%2582%25D0%25B8%25D1%2581+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+pdf+2020
    • http://kuxozaser.quartzsmith.com/uploads/1/3/0/9/130969472/wovexiwidogavu.pdf
    • http://files.stdastoriayouth.com/uploads/1/3/0/7/130740053/kefagev-woronalotixul.pdf
    • http://files.camiebianchi.com/uploads/1/3/0/7/130775402/dumiteremamiwu-fojeponu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/22111249308.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/zutodekaxetifoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/gedaxuronepakuduxunimip.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/29169350703.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/fupanajoxipuzab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4494/6588/files/beluboxifamutivuboxasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/gizipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/xuwijerax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/29036713887.pdf
    • https://cdn.shopify.com/s/files/1/0433/6517/1354/files/23550059158.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/51501125356.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_off00005331.bin
21769758193994942b929a6301f4c4b9d2b9068b19ea5fb18a343e2d64d66989
pdf-font-stream PDF embedded font (sfnt) at offset 0x5331 6736 bytes
font_01_sfnt_off000069ce.bin
73b91ee62720c7d5b984ce906c4a4102d4b4b274d4bfc5ae61f3320e5ec81ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x69CE 14860 bytes