Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fbca421885dde0…

MALICIOUS

PDF

45.6 KB Created: 2020-11-02 01:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f6e82c5623f38f8800aec276047a9d15 SHA-1: 36482b7c5db1b36fe1a0925e086591f3e0f70e9c SHA-256: 71fbca421885dde02ed093875af0de48d5bfcd3b72b3b17799e3ed355326b8a6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, along with numerous other PDF links, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. The primary malicious URL is https://ttraff.cc/123?keyword=chrome+download+older+version+windows, which is presented as a download link for older Chrome versions, likely a lure for malware.

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.cc/123?keyword=chrome+download+older+version+windows In PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/1565504.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/4379220.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/dagawasoxi-witamumobu-bogom-gutake.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/xijanatokimes.pdfIn PDF document text
    • https://noxazifegem.weebly.com/uploads/1/3/4/5/134596672/lubulik-tajivaxogovoxe-rozag.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/rurugupitemu.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/4664498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2356/3434/files/biomes_of_the_world_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9279/3238/files/nodikejururex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0581caa0-0908-4423-a491-13005a923ac2/59146887832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9300/9604/files/download_roblox_apk_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5698/2937/files/roads_of_rome_game_free_download_full_version_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8210/2984/files/webebiberidejuputapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6892/0486/files/dolefopaxitubojapafi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 5124 bytes
SHA-256: 283b1624d823139f13393e2e518dbdeb3bbedad5961f5669807fcc0c583f50bf
font_01_sfnt_off00008574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8574 10620 bytes
SHA-256: 9e81d9b59829e154a46ac1d48b902b728bcb7c14b895db7cc87d859f26a316c4

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