Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f6d4b0f2f0eff…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 12:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b50fbc7dadcd9fa60559af25f7a3244 SHA-1: a0f3f98c3977ad14956fc21dde8472df66faa516 SHA-256: 5a7f6d4b0f2f0eff20560185d683b7f109560d51f0799c488bf4c4001ddcc62d
202 Risk Score

Malware Insights

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

This PDF file contains numerous links, including a critical redirector link to 'ttraff.ru', and multiple links to other PDFs hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'Adobe illustrator cs6 tutorials' and a URL, suggesting a lure to download a malicious file. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+illustrator+cs6+tutorials+for+beginners+pdf+free+download
    • http://files.anncarragher.com/uploads/1/3/2/7/132740685/2518897.pdf
    • http://jomij.jolenewright.com/uploads/1/3/0/8/130813765/samumof_wixafutubokoko.pdf
    • http://files.littlebitofheavenadoptionreferral.com/uploads/1/3/0/8/130813991/zumudimeri-vuxiwezijan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/16528071217.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/nesazusegetusitunam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/captivated_by_you_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/vaduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/boloburavomokemuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/zijizekorobimazuliginun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/palekigisur.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/72966199591.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/mabipidum.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/kuzazaladijuvenililogev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/jefokajufexifesosar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/zazipezawebevebizixax.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_off00006110.bin
4bdd7537c9702ba2eda0953cae84f963609dfead845603f9fd4515952edc14d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6110 5700 bytes
font_01_sfnt_off00007488.bin
3e0af1fabc2081ad2327dc7842b3bf288bcabb7890882e6d53bfe0499b5f7e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 10024 bytes

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