Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcac79a380e4d5a2…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 17:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84f8b27e5e50a36c6ad29c29a1c5f5c SHA-1: cfc70ea1ce70821ccbc6e431991d8fb7ad910598 SHA-256: dcac79a380e4d5a2b26cf2aba7b8d5fa8938108642ad02255e61979f409a53db
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains, but one critical link to 'ttraff.cc'. The document body contains obfuscated text and a URL that appears to be the primary malicious payload delivery mechanism. The presence of multiple external links suggests an attempt to distribute malicious content or phish users.

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.cc/wb?keyword=metaplasia%20apocrina%20pdf
    • http://files.canarellics.net/uploads/1/3/1/4/131407818/c24e71.pdf
    • http://files.kicksvilleshop.com/uploads/1/3/2/7/132710665/wosit_gadusujuleb_jemilapoborifu.pdf
    • http://bejenuv.rstne.com/uploads/1/3/0/9/130969656/ximup-dilamo.pdf
    • http://files.spiraldancinglife.org/uploads/1/3/0/8/130814855/2579857.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/osrs_how_to_check_ping.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/simple_jquery_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/cardiac_cycle_steps.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/7846322701.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/lafowofep.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/rafenafewatiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/reraz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4140/7644/files/kofujobusuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0481/files/rilelozimekorot.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/tajimazota.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/16461247474.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/john_deere_sabre_14._5_38_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/tibiviwilusonugavew.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8568/files/86105520865.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_off00006772.bin
3791f81e14c657fda3037ed32727d6a6e820c948824e5a6b7212ab9fe54a33de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6772 5156 bytes
font_01_sfnt_off00007904.bin
8fe962ee846d08a67dadb6e78b63f4836eb15455f167d9cc3d536d6ea50df7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 10244 bytes

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