Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2be1d9e9c8325f…

MALICIOUS

PDF

36.8 KB Created: 2020-08-18 21:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9761559f003c6759cd21c7504d334c SHA-1: 96d47f5ce681232b53afb44ecf7a9210831d1069 SHA-256: 1c2be1d9e9c8325f62c76dc17545d4c43ec43c4e71b60cb02bb67bc688eabe21
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though obfuscated, contains text related to financial ETFs and the wkhtmltopdf tool, suggesting a lure. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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=ishares+international+select+dividend+etf+fact+sheet
    • http://files.beyondhappyatwork.com/uploads/1/3/0/8/130814633/3fb2e1aad21ab.pdf
    • http://tukij.gretchenc.com/uploads/1/3/2/7/132740805/xejomoxuk.pdf
    • http://files.gemscorner.org/uploads/1/3/2/6/132695519/xiwamuxob-namufaluxo-rifuxajemavage.pdf
    • http://files.faithconnectionsonmentalillness.org/uploads/1/3/0/7/130739155/2543682.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/download_adobe_reader_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/zodusetisugirisini.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/84108976618.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/71892139977.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/26021314236.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/50941248641.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0077/files/php_associative_array.pdf
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/obsessive_compulsive_personality_disorder_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0437/2326/0058/files/69743506126.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/33_septa_bus_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/creative_writing_teaching_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/malayalam_christian_songs_free_sites.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_off000051c2.bin
d83d61e15a589915966ce26de82f044a9f11699f3fa2f9cbb707f782a78c2618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C2 5104 bytes
font_01_sfnt_off0000631a.bin
c0b105fac8cb96879a2ac49c99b56cdf9a027d4c5953e615809f438e6b30fc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 10156 bytes

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