Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edce0cda175353b…

MALICIOUS

PDF

37.1 KB Created: 2020-10-28 23:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f930866ddc0380f52679491913270886 SHA-1: 4a4fbdbea0d292cf5731f65ce8083fa230db8f72 SHA-256: 4edce0cda175353b36b7564f3fb0720e24d3346edf2601b8f8d8f895299d6af2
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 large number of embedded links, many of which point to PDF files hosted on various platforms. One of these links, 'https://ggtraff.ru/aws?keyword=borreload+savage+dragon+price', is flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites.

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://ggtraff.ru/aws?keyword=borreload+savage+dragon+price In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f92d5192f383.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/tilowanabijedejexufa.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/3816822.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/1/0439/3009/1688/files/mosibuboturowerebumex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0409/9241/files/nibusexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9051/9221/files/play_store_download_for_android_mobile_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/pirokekatedigaboborime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1049/0022/files/drum_machine_free_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2854/7237/files/best_video_recording_android_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2297/4627/files/signos_vitales_scielo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/bununebolirup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5781/3925/files/abraham_lincoln_internet_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16eebbd8-b369-429f-ac9f-ee508134ad28/denaxij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6687/3798/files/manual_impact_driver_harbor_freight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3482/9222/files/craftsman_power_washer_2500_psi_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b366b034-e6a4-4634-9235-4c51694b14aa/40099442532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/bobcat_new_stanton.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_off000051a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A0 5348 bytes
SHA-256: a3df6b5762c9bd33bb012d77ffd498c7621cdf3f4c729eb2bad2bab635e6fac9
font_01_sfnt_off000063ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 10508 bytes
SHA-256: beb2731f54ab2baf4dd24cb97430b88fb18300f068d1ff729dbbe1b53bcd82c1

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