Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7a953c53d357ae…

MALICIOUS

PDF

55.9 KB Created: 2020-08-10 12:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561010c8d530f59e763d9acc0e19dbb5 SHA-1: 5c67781ab01f32ba81346f751c2d8ef24e2cb372 SHA-256: 4c7a953c53d357aef4eab03e033f802af9e17c569fab9b8612e7931a13c1a74e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to an 'aptitude test' and includes the malicious URL. This suggests a phishing or social engineering attempt to direct the user to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=%25E0%25B8%2582%25E0%25B9%2589%25E0%25B8%25AD%25E0%25B8%25AA%25E0%25B8%25AD%25E0%25B8%259A+aptitude+test+%25E0%25B8%259E%25E0%25B8%25A3%25E0%25B9%2589%25E0%25B8%25AD%25E0%25B8%25A1+%25E0%25B9%2580%25E0%25B8%2589%25E0%25B8%25A5%25E0%25B8%25A2+pdf
    • http://files.bristolgeogsoc.com/uploads/1/3/1/4/131438583/vugawitunasofo_difijomevunogal_bevotu.pdf
    • http://zewukija.armenianrugssociety.org/uploads/1/3/1/1/131163635/vuparopazif_furedapen_betuxewozufu.pdf
    • http://files.shop-perfectly-impressive-store.com/uploads/1/3/1/0/131070291/f0df8c6474858d2.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/sujekutaso.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/majofogunowononetemulibos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/55622027776.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/jokutetatapewaduteboxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/78240725717.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/2003_honda_accord_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/gungeon_directional_pad.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/ronawukos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/muzok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/air_pollution_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/mabuwikag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/keraroduf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/gurafidukepugado.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/67232421267.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007f26.bin
989d9cc0f0b543b1e704b8d5e60607e1cbb750199e61510ac5beda56c2d9a2d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7F26 18088 bytes
font_00_sfnt_off00005933.bin
6389ea82bd7f86d6aefeb11b7706e5aa1a4bca6ccf138938e9386849287de73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5933 4812 bytes
font_01_sfnt_off000069a0.bin
ce8168fe634d2e965ebdda66ea06e2332f833d0b3822e1b2bbb8e8cfe2f89da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 8208 bytes
font_03_sfnt_off0000af9f.bin
b4cd2cd084afa030e246cdb6dcccc5aaa09605d7aaed0cff31249697c271f513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 8852 bytes

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