Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b8a1f887e632e6…

MALICIOUS

PDF

35.1 KB Created: 2020-08-25 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b41e7b94982235380118e0523900dd54 SHA-1: ad5a3d86cd89dd7744f97a868fef6915a2be968f SHA-256: 45b8a1f887e632e648129ed4f9a269dca511579abe8d413efe5b006d6f33ed51
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for a chemistry ebook. This link redirects to known malicious infrastructure. The document also contains a large number of embedded links, many of which point to Shopify, suggesting a link farm or SEO poisoning attempt to increase visibility. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=chemistry+raymond+chang+ebook
    • http://rotunevu.westoneheatingandair.com/uploads/1/3/1/4/131406893/2286b372b63.pdf
    • http://files.vagalschwannoma.com/uploads/1/3/1/6/131637308/mojozu_mixigujiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/gapavugekot.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/luwefevadib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/10_examples_of_spreadsheet_application_packages.pdf
    • https://cdn.shopify.com/s/files/1/0448/0391/5933/files/how_to_make_book_type.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/66065159367.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0827/files/bifonorenazejus.pdf
    • https://cdn.shopify.com/s/files/1/0447/8402/5751/files/electrician_tools_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/i-_751_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/bhumika_sharma_song_hi_fi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/aws_certified_cloud_practitioner_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/2831279446.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/pajifagobudeg.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/negejogej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/constructivist_theory_international_relations.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/69675533103.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_off00004b8f.bin
279f729c2fe05cf4a8b17484d92bbce6a6fc17fd014984db0d8c34b4a203b970
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8F 5532 bytes
font_01_sfnt_off00005e3d.bin
11a92eae5ddd605bc612f9c674c4a81c9e18275da43b586f5b9f351362d656d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 9672 bytes