Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f78f4d1a0989f33…

MALICIOUS

PDF

36.8 KB Created: 2020-08-22 07:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e7ae8cb44df508696dd60cf17114b3d SHA-1: bd4fae0ee70e845ab615331fe0d7a92c0a3e16ba SHA-256: 4f78f4d1a0989f33e1c2ac5c8465b14338d234ff39903ec71202b5562887b51e
128 Risk Score

Malware Insights

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

The PDF file contains a lure related to movie ringtones and includes a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the same lure and a URL pointing to a redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, including one that leads to a known malicious redirector. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bazaar+movie+all+songs+ringtone
    • http://bisila.nassaucountynyhomes.com/uploads/1/3/0/9/130969042/fibujewikek.pdf
    • https://cdn.shopify.com/s/files/1/0440/1099/5862/files/4845005316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/14246009312.pdf
    • https://cdn.shopify.com/s/files/1/0431/7305/2575/files/exceptional_c_style_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/paxisurigakutilit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/what_does_insure_domestic_tranquility_mean.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/bootable_cd_format_tool.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/xosononelezefegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/hybrid_beamforming_massive_mimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/four_stroke_performance_tuning.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
font_00_sfnt_off00003f86.bin
3c3854c580134e2a187f2553b165735c6d539a20719d7ad8a4b0d011e1f26133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F86 5164 bytes
font_01_sfnt_off0000510f.bin
d47505ab99eeb47b4b078e36db84420237f17091fde4b097319ae5a4207c9d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x510F 9420 bytes
font_02_sfnt_off00007188.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 16092 bytes

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