Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b595b7530df939d…

MALICIOUS

PDF

66.5 KB Created: 2020-08-28 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3835b2699904d8e786fe5fd78b9cb4aa SHA-1: 952cb3f41c6d91d91a679f4f52446e641f3780eb SHA-256: 9b595b7530df939d681c5d5f45f7d8197cbc433b8d11634f67fd7a331b395167
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=o%25C4%259Fuz+atay+tutunamayanlar+ka%25C3%25A7+sayfa'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled text with an embedded URL, further supporting the malicious intent.

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/wix?keyword=o%25C4%259Fuz+atay+tutunamayanlar+ka%25C3%25A7+sayfa
    • https://static.usrfiles.com/ugd/b8c837_6dc7f39e312144e18ce24ed2f66e7f4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcbed99362e3420ea838c0c4bbed583e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbe673e0fad465ca3f6a0cec99cd676.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c206f1c44d043f999a4bb4ab4a159e7.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/alimentacion_balanceada_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/downloading_ios_8._3.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/jumawujomevunimugawamebur.pdf
    • https://cdn.shopify.com/s/files/1/0440/7567/9896/files/adobe_photoshop_cs6_actions_pack.pdf
    • https://cdn.shopify.com/s/files/1/0447/8923/5861/files/50084487462.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/30649457921.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/95917956002.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf663ef75b884e2ba445f1a2d681b5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a4cd7e5bdb84ac685d4471abb899625.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_off0000c0ee.bin
def17cc615bdd5334bb47ddfc1889160b2e36d09965f469ce0a8b6ddbc79d170
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 5568 bytes
font_01_sfnt_off0000d3e9.bin
191cd789c874ae3396b945d4ba4b583d4207ed807ccf4ef5bf8450c21db73579
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 12584 bytes