Malicious PDF — malware analysis report

Static analysis result for SHA-256 919805e4b4af3c02…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 14:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a99d300073cd5bb1777655e79847b0ea SHA-1: ef3826a99a4c5de58dc7af0f5af14667baeeb2a0 SHA-256: 919805e4b4af3c0251a731e9d81060bc530163e3758e65ddd05796368c7060d0
150 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a redirector service (ttraff.ru). This indicates a link farm or redirection attack. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bhojpuri+gana+2019+ka+ing
    • http://files.livinghopepregnancyservices.com/uploads/1/3/0/9/130969655/3d7d9a.pdf
    • http://files.headstart-upshur.org/uploads/1/3/1/3/131379231/3528631.pdf
    • http://nuzam.course.amsterdam/uploads/1/3/2/6/132696323/6928368.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/zenuvumekiwovu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9444/8030/files/54590081408.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/59009893863.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7596/files/37285454785.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/72905227463.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/48557992753.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/wukiraxetevereponure.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/woridikosiganib.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/88437567670.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/wujatitegigakelogomaputu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/37267241831.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_off000069b8.bin
169fccbcc4a558643df124564f91f5dc16ba3a1ae20718e6f769e8655fe76b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 5540 bytes
font_01_sfnt_off00007c9e.bin
bbe4cc33a6c1f017f8f120ad68062583f1925517c25c216778f8363723fdfe1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9E 10012 bytes

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