Malicious PDF — malware analysis report

Static analysis result for SHA-256 db22de792794994b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-08 08:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af32c3003e1179f4f050c06b67cb3d6 SHA-1: 233225c88847d68d2a982096e4511013a1a2b5c2 SHA-256: db22de792794994b7c93fa7ddf22b77108b3bfa9c2900a973727da1d97498425
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=corso+italiano+pdf', which is flagged as a malicious redirector. This suggests the primary purpose is to lure users to malicious sites.

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=corso+italiano+pdf
    • http://files.markmunzertcowboypoet.com/uploads/1/3/1/0/131069879/6837495.pdf
    • http://files.mengshuyou.com/uploads/1/3/0/8/130814066/novunozu.pdf
    • http://files.synergglass.com/uploads/1/3/1/0/131069869/fivajodasikadu_neposidox.pdf
    • http://files.ryanpfouts.com/uploads/1/3/1/4/131438167/343e2010937f36.pdf
    • http://files.progressivepsychologicalservices.com/uploads/1/3/0/7/130775543/4682171.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/perobabeverategaluviwarod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4551/9513/files/74789381717.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/bojuduwobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/weluwibifafub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/regular_expressions_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/munodivemonegexexak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6202/files/49919273952.pdf
    • https://cdn.shopify.com/s/files/1/0441/1470/6584/files/bertrand_russell_essays.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/xafisar.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/how_to_premove_chess._com.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/the_kabbalah_unveiled.pdf
    • https://cdn.shopify.com/s/files/1/0434/0711/4391/files/dewevusobofakuxakalose.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/insanity_fitness_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.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_off00005d82.bin
6db2d99da5669bd88e9268f35a00a311d3b7b7aa30482b66593b1172361c0fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D82 4940 bytes
font_01_sfnt_off00006e5a.bin
35f5ed30920c9d804c3d8b290f6e926be80f7b56415f27d4d2e449e261ce1d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 10936 bytes

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