Malicious PDF — malware analysis report

Static analysis result for SHA-256 7931ed59936e5473…

MALICIOUS

PDF

63.7 KB Created: 2020-10-26 13:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7e23f4f1fd7e77fe12a66b5998e7a8c0 SHA-1: 7db73513f93320d38f31f29c0ba9eca843ea33d8 SHA-256: 7931ed59936e5473c5963c8c539fed9e6ba7b365216216ddbeac605eded3dae6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO link farming or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. No scripts were extracted, but the overall structure and link farm suggest a malicious intent to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/aws?keyword=konsep+dasar+akuntansi+manajemen+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f911b416974a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8eac7ba5459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8fdfdb623bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5f8dcac405a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f8d3ba5d5d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f86ff738963a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8d36998b362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f92910f3acac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f8bba1da31b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5f9429c9163f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8ef8c48fa43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5f90f8f87931e.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/7329919.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/1128d1973.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/joniwamekalo-gezobedulobabaf-ratura.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://cdn.shopify.com/s/files/1/0466/5281/7573/files/download_game_leisure_suit_larry_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7847/8743/files/how_to_make_armor_stand_in_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/common_resistor_values_e96.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6087/7224/files/3591448290.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/aquarium_fish_names_with_images.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/apsc_exam_question_paper_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/biliwopox.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/dejemolezoxefen.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000921b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921B 5148 bytes
SHA-256: 324ada86770323bc05addc29b44974183ddb4c4b9ca45d7a9e57342f640ee2b0
font_01_sfnt_off0000a381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA381 10472 bytes
SHA-256: 86ba17ddccb137fdb9a8880bcecbe40ac3eb244f03ce37a99a4f7f4cbc4e88c4
font_02_sfnt_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 17896 bytes
SHA-256: 16597e9e7ca5f42e6974afff9be1bd20dafeca012df03545c234653e6b3ba81f
font_03_sfnt_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378