Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cdaa9af69cd945…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 00:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9675149fb79544d241c80795eb909da SHA-1: a129a5ed14e25b6c98226dffd979a5fb532f4023 SHA-256: 82cdaa9af69cd945dccffd215c5ab55ba8031259f160bd9141071ae1938166b6
154 Risk Score

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 a link farm infrastructure designed to redirect users. The primary malicious URL identified is https://ttraff.ru/pify?keyword=teacher+guide+grade+11+maths, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=teacher+guide+grade+11+maths
    • http://files.masterclass-editing.com/uploads/1/3/2/7/132712225/bc37a8f5ad82cd9.pdf
    • http://files.geierbrainlab.com/uploads/1/3/1/3/131398195/a6deaa8fa5f0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0431/0535/3889/files/kedaver.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6669/files/revista_boticario_ciclo_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/39469821192.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/67961975796.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/zusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/bleach_brave_souls_beginner_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/76883686291.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/37336316148.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/likinetegibovifunab.pdf
    • https://cdn.shopify.com/s/files/1/0444/5034/9223/files/free_offline_english_dictionary_for_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5831/files/32579342318.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/adaptive_cruise_control_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/29810939158.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061be.bin
0cfb7257c4db1b87585b1a24a16dbf6b5111c57c8eb2f286b2d7a40fdcfd64ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 5320 bytes
font_01_sfnt_off000073b4.bin
8e9bce335149eeb6573458b567da268952f542a9042c5a8fa76daaa300681ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 10140 bytes

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