Malicious PDF — malware analysis report

Static analysis result for SHA-256 683dd3f55d033ddd…

MALICIOUS

PDF

49.9 KB Created: 2020-08-15 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95cef919fe31b20983007ebd830aa706 SHA-1: 5e26c7bd81c76e10036a010fb0ca0683b8ff6181 SHA-256: 683dd3f55d033ddd8bd0abcc1930e0cc1804aa7740ea87afccc9bb415f38f4bc
202 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a phishing or malware distribution site. The presence of urgency and MFA lures further supports a phishing attack. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to exploit user interaction for malicious purposes.

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=bohemian+rhapsody+sheet+music+piano+musescore
    • http://files.ambcircleoffriends.com/uploads/1/3/2/3/132303001/2152254.pdf
    • http://files.roseandwild.com/uploads/1/3/1/6/131637308/2775821.pdf
    • http://files.decadehorribilus.com/uploads/1/3/2/6/132695994/054885579e2866.pdf
    • http://files.slightlysharpenterprises.com/uploads/1/3/0/7/130775432/5406091.pdf
    • http://didunap.mufonlosangeles.com/uploads/1/3/1/4/131437657/bidumuwozami-nunirir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/wexufakebunorulaseximalab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/27724808769.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/92803405577.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/guzalosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/santa_biblia_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/22511701837.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/imperative_programming_for_bsc_it.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/80019662812.pdf
    • https://cdn.shopify.com/s/files/1/0439/2566/7995/files/new_mp4_movies.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/nupigokumajosow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/all_important_days.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/antimicrobial_activities_of_garlic_and_ginger_extract.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/dotovumurode.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007647.bin
36a14291ab224a89bad16f93b34b292fcca691481f2c86db604bb28932675b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 5316 bytes
font_01_sfnt_off00008827.bin
2aaaa2c2a19f5291d1ebc7c5000951afb42ed2da51284117635b7f3c532b9b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8827 10580 bytes
font_02_sfnt_off0000ac40.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC40 4324 bytes

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