Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2907fa9bc351ef…

MALICIOUS

PDF

43.1 KB Created: 2020-10-26 00:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6d3e6b8a9f48e2ce1a1ec78157ab33ff SHA-1: 3e358a2bda62943a7c27927622102efcdd540b6b SHA-256: 3a2907fa9bc351ef1301b97059d258c27e611027e4c7cdc5bdf3f5165ad25135
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users interested in Android/iOS emulators. The PDF also contains a large number of embedded links, many pointing to benign-looking PDFs on S3 and Shopify, likely part of a link farm to improve SEO for malicious content. The primary malicious IOC is the redirector URL.

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=android+ios+emulator+pc In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/sozafanimitu_lepebe.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/sasitazopuwi.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/towenujixatef_kamabodativi_wewameboxolute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/math_vocabulary_words.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/49284334608.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/84632331607.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/43785843984.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/68453578740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2254/4807/files/diablo_3_crusader_hammerdin_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4028/0223/files/call_recorder_android_9_samsung_a50.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/talk_live_chat_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9b19bc-9df4-4083-a7f4-f9486fcc61b2/41932472787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213cc3b3-0ac3-40b9-9246-217f1595a9c5/gonutamosowixonuboza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cbb8f6-e3a8-45ef-a73d-ce5abece12d1/runibobebaboviva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32344625-7ee0-4cf8-830a-939b1c6f786a/36620338529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdc3843-49b7-44a1-b41c-0f527bb33b5f/45030130159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/nafixazinuvozobixol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/9305558024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9451/8181/files/law_of_reflection_of_light.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5767/5421/files/best_free_tetris_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0124/9444/files/musculoskeletal_ultrasound_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/moxulo.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_off00006993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6993 5208 bytes
SHA-256: 7a6d0e6f367179e51ac958e6f2e0e341c183e97bc9cfe93aae3dddf6ed950534
font_01_sfnt_off00007b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B27 10576 bytes
SHA-256: a4cfe4dfb9f5941864a2f6c479d5d337d891d1841f0c21911afaede453148936

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