Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aefd792b479bab…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 02:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e93dd702d88426ac02192b096e8d299 SHA-1: e3c6bf4ebe2d5101c1977da53ecd8e89ae9a4f70 SHA-256: a3aefd792b479bab60eb33f4ad30dbb1bf0e34c996b27ce3f963ca2da635c240
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing 'Viber backup app android' and a URL that appears to be part of the malicious redirector chain. This suggests a social engineering lure to trick users into clicking the malicious link, likely leading to malware download or a phishing page.

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.cc/pify?keyword=viber+backup+app+android
    • http://remazol.iwantmyjacketback.com/uploads/1/3/0/8/130813330/4584052.pdf
    • http://files.baronehealthcenter.com/uploads/1/3/0/7/130775828/gumara.pdf
    • http://nijezuv.shoprosethorn.com/uploads/1/3/1/8/131858661/868989.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/jilusezotakarorubod.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/wotukiloxikot.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/list_of_b_pharm_colleges_in_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/selenium_chrome_default_directory_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/hypertensive_emergency_guideline.pdf
    • https://cdn.shopify.com/s/files/1/0461/7037/4307/files/83000868637.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/nonujapivitevepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/cloudformation_ref_s3_bucket_name.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/jquery_wait_for_element_to_exist.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7003/files/aking_pagmamahal_lyrics_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/95476662097.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_off00006500.bin
c7c5830de35fe7498cfe8ff7cb4754a2a1e7a419f0e135c215c25cc4e67f8a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5024 bytes
font_01_sfnt_off0000761e.bin
0199f734134041d5c13d074fdf960f4f4a868d665172ac769e2474d347cb45b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 9996 bytes

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