Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dd2d24b2bdfabe…

MALICIOUS

PDF

50.2 KB Created: 2020-10-27 18:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e3e708a12eb5b810a853c50183b97a4 SHA-1: 77f878b814e107c21201a38ad078e62cfc03807b SHA-256: 91dd2d24b2bdfabe1ce84eb0477154be56a22d745e289f1c6c3247b5f6aa3627
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.com/123?keyword=love+language+survey+for+couples
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f8fb1074077c.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5f9760438eed7.pdf
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f90df95d5d39.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f879e61e74a1.pdf
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f930566a03de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2a6875d-bdcd-48be-9e0b-fc565c289c25/18417603089.pdf
    • https://uploads.strikinglycdn.com/files/4aab708f-9416-43d1-871a-b97b1075109c/47126808461.pdf
    • https://uploads.strikinglycdn.com/files/516d72f5-8be0-4847-ac8b-264a4c6742a8/kikajiseloxamuxapuxamukuj.pdf
    • https://uploads.strikinglycdn.com/files/71a4b88e-8d3b-47d3-89b4-aed3124643e8/rananuvijoresefifizasu.pdf
    • https://uploads.strikinglycdn.com/files/ce76fc88-cf5b-4d6c-ac98-9c06189b629c/vivizuges.pdf
    • https://uploads.strikinglycdn.com/files/c1c3c4c8-e1f7-4a0d-9f09-66b74d5868d3/youtube_mate_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0487/7382/4678/files/99_unblocked_games.pdf
    • https://cdn.shopify.com/s/files/1/0483/7969/1168/files/81590506319.pdf
    • https://cdn.shopify.com/s/files/1/0486/0752/7077/files/ganixozilijovomupupawu.pdf
    • https://uploads.strikinglycdn.com/files/c785f57f-8467-4464-8431-71b24f52ffdc/8193917720.pdf
    • https://uploads.strikinglycdn.com/files/f6fe99a1-772b-46df-9e20-56b5bc432b63/6573076177.pdf
    • https://uploads.strikinglycdn.com/files/c6369e21-f8ce-4e43-8215-a867ac31f7f0/8317489835.pdf
    • https://uploads.strikinglycdn.com/files/ec2f7f2c-ef98-4e93-bdfa-e8579d5b6f22/zusitonel.pdf
    • https://uploads.strikinglycdn.com/files/6a45c7e7-ee67-43b7-b1aa-2ef744247f7b/wojakavusufajoz.pdf
    • https://s3.amazonaws.com/fujadabez/authority_letter_format_for_rubber_stamp_making.pdf
    • https://s3.amazonaws.com/badodemebo/2029721025.pdf
    • https://s3.amazonaws.com/defujo/direitos_autorais_lei_9610_98.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f9c.bin
f3f0189cd5078f90432b99a947e2a44502b112351200aaddda1eb23686f63f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 5288 bytes
font_01_sfnt_off000081c7.bin
a6f35c98c86e35265d6c8ce6afa4bb8ca7d151d3f2d42811c318a5e2d4775424
pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 10420 bytes
font_02_sfnt_off0000a55b.bin
4737f6cfef85770128e047f524c2f4cf39220b401ed1e61759cd467f3096abd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA55B 16300 bytes