Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f50b2470dbfab8…

MALICIOUS

PDF

47.6 KB Created: 2020-08-30 16:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a71ad53444fa06783930a967fd9b0d3 SHA-1: 0aedb0feead8296b48673259fe37a8f3aee216e3 SHA-256: 59f50b2470dbfab8df1f2c643c86e48bad4687e940adbe8677e2a57762626b55
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=python+t%25C3%25BCrk%25C3%25A7e+d%25C3%25B6k%25C3%25BCman'. This indicates the document's primary purpose is to lure the user to this malicious site. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to obscure the malicious redirect. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=python+t%25C3%25BCrk%25C3%25A7e+d%25C3%25B6k%25C3%25BCman
    • https://static.usrfiles.com/ugd/0fdb6d_a3e4010315c9495087585d46576ed5cc.pdf
    • https://static.usrfiles.com/ugd/3f80ec_dffa6871d1dd48f9839a06eb271f0d8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67547e265e641ce818250a70770c834.pdf
    • https://static.usrfiles.com/ugd/166c09_b44c5b24bef44f199c9a9ebc8f5544a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd95d354f52045b6937cb42309b17429.pdf
    • https://static.usrfiles.com/ugd/739437_03d82c8ad8074bc2856f89b692558d2c.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_9ae07bc77fe74b0ba4c90204c1c1966a.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/dabasuvudulidoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/nstm_555_revision_13.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3864/files/autodiagnostico_personal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/debate_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/ncoer_support_form_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/centralization_and_decentralization.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b78.bin
1c045c5151d40ee4b51601469e83880206861937fc45cec5f61104018b2bf4a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B78 5200 bytes
font_01_sfnt_off00007ca6.bin
73cd8079283475aeb13f599b3fde148691e14f2eeec6dce282f7234d6c9ff45c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 11996 bytes
font_02_sfnt_off0000a1ff.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FF 4324 bytes