Malicious PDF — malware analysis report

Static analysis result for SHA-256 91403a121ffb255b…

MALICIOUS

PDF

49.2 KB Created: 2020-10-19 14:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8ddee054539afce11fa22309d84ea52 SHA-1: 996a5fd1676cbc183dca226b0d586c371768c373 SHA-256: 91403a121ffb255bc3da8fb5104be65a03deb4587b81ee26219e0d3af29a7330
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to external PDF files, a technique often used for SEO manipulation or to host malicious content. One prominent URL, 'https://ttraff.me/123?keyword=arquitectura+contemporanea+mexico+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the PDF content and the malicious URL, suggesting an attempt to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.me/123?keyword=arquitectura+contemporanea+mexico+pdf In PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/cff837.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/cf3e6d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wabuvavinilexe_tisipojosare_porufibavuga_laxap.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/2670979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d01a822d-fe4f-4909-8b76-254133aae6c1/fepukodopewevemegasegam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fb71e7-2743-4eb8-8fbc-0c0ecd9ded14/mipusuvono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56860d90-394e-4b4b-9732-3293935c9c89/giwonikis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5815bb71-a237-4431-a562-2200cba6e15a/gokixatepajaxojuxapib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ba4207-7b28-40d7-b220-5fc97b41c9ba/32352354778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8604/5889/files/fallout_4_wasteland_survival_guide_issue_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/stihl_ms170_chainsaw_parts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7527/2349/files/animal_crossing_new_leaf_rom_citra_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56a0a3f-912b-481a-a90a-6c34e994d299/78174591922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730c15d3-bfbb-4d73-b65b-6d0db516141a/xubarabuvamavuforuvevide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233a3dc5-33cf-4a9a-8c3b-e2f31ebf913b/surajujizefototezesaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1049535-d3a6-400e-b39c-ecedf4d3c491/rinaxesabosezonupan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1db286-c407-470f-823f-15c5dc7c0246/fivimiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5705/1808/files/wide-flange_shape_properties.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/9815/3383/files/87799626226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2991/1957/files/how_to_archery_hunt_elk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1896/7450/files/tabular_in_latex_column.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/dupray_steam_cleaner_instructions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000713d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713D 5156 bytes
SHA-256: 44126765a4f5846d53e7c73ed6fe6d5392f5c7f8342b75513434fa6e800096c3
font_01_sfnt_off000082aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AA 11304 bytes
SHA-256: baf4cdd81d5aff2c2fbdd42d2517f838d85f2d5110a19596ddce2b16e0396c9a
font_02_sfnt_off0000a79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA79B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333