Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2ea6568a03e8f8…

MALICIOUS

PDF

48.6 KB Created: 2020-08-09 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa5e88e4f08323a165778a9663144fb4 SHA-1: 66e882923c3d55b5dbab2119771531f6445af8da SHA-256: 4b2ea6568a03e8f83e034399cb5f901a650a5c69fd0289f94a4740a4e6ba3564
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious content. The ML classifier strongly indicates maliciousness. The document body contains the redirector URL, suggesting the PDF's primary purpose is to lure users to this malicious site. No scripts were extracted from this sample.

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=english+language+teaching+journal+pdf+free+download
    • http://febemem.capstonelegacyscholarshipfund.com/uploads/1/3/2/8/132814930/sesisoviragaf.pdf
    • http://nikomisi.thebrittajones.com/uploads/1/3/1/6/131606201/xafukemavifobe.pdf
    • http://bepifowu.jillhunteclecticart.com/uploads/1/3/1/4/131437657/156e80.pdf
    • http://files.wpnaturespa.com/uploads/1/3/0/8/130874284/32cc3bbd707.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/40029963503.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/woxawiraxukabenupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/17826282057.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/ejercicios_de_rima_asonante_y_consonante.pdf
    • https://cdn.shopify.com/s/files/1/0437/0792/4635/files/jdk_1._8_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6271/3754/files/tosuzixavogixekivoloro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/66999482887.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/95880143606.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0407/files/astronomy_a_physical_perspective_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/fifowepaburuwevatineke.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/javunu.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_off00007076.bin
06596045b46cd9b0e55b89b670b552e1623282ccdaf9d0ac496d4d6e1b42a7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 5424 bytes
font_01_sfnt_off000082f2.bin
4ddbb25791baac0af6ceb5c4a917a10a07f7dc7c994d7d317469e6f1780f508b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F2 10360 bytes
font_02_sfnt_off0000a666.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA666 4324 bytes

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