Malicious PDF — malware analysis report

Static analysis result for SHA-256 f021b4af7093e5d2…

MALICIOUS

PDF

38.4 KB Created: 2020-08-31 07:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46255bd6e0a66703c4f4fa01122fd789 SHA-1: 66435b25bae522eafb125e046abe5776390cb448 SHA-256: f021b4af7093e5d230a2ebe874f8f787bb3e2016851c00913d56704c54f333b9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily corrupted, contains text that appears to be a manual title and references to the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL found in the document.

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.com/wix?keyword=grasshopper+325d+manual
    • https://static.usrfiles.com/ugd/c0fca2_41f6cfe41d3242a2b09d9dd5646d8959.pdf
    • https://static.usrfiles.com/ugd/ab059d_f18adcd116b24365a8a5832e78ae4899.pdf
    • https://static.usrfiles.com/ugd/30e015_9697431ee4a2484fa730d085a5606b6f.pdf
    • https://cdn.shopify.com/s/files/1/0441/1041/3976/files/70045469577.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/kubisizaxeka.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/32654231760.pdf
    • https://cdn.shopify.com/s/files/1/0434/6701/4297/files/oxford_chemistry_a_level_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/numerical_mathematics_and_computing_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/gisawoburegegojevopedamu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/55072987912.pdf
    • https://cdn.shopify.com/s/files/1/0433/6454/8762/files/old_man_and_the_sea_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/autocad_for_mac_high_sierra_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/adjetivos_en_ingles_y_su_significado.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_off00005637.bin
cd24e5070df5eee21a2b35599b0bdb017fa3a1d58ff79057786379d2a07f6c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5637 5648 bytes
font_01_sfnt_off0000694f.bin
10a01960683b82b17019a82e6370c6699b5c4feed2304969fa6ed46dd2214b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 10536 bytes

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