Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d39cd5f95b45be…

MALICIOUS

PDF

50.0 KB Created: 2020-08-18 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e9aec339aad7d4f33446e8d256fba86 SHA-1: 329cf1747b536008ca18e0dfe9318eec98f4411d SHA-256: 16d39cd5f95b45be9dc0aa5d3621624072fab305c10d8d72f973594def4a62ea
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 designed to host numerous PDF files. One of the initial links redirects to known malicious infrastructure, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, indicating the primary intent is to lead users to harmful content.

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=alarm+app+android+example In PDF document text
    • http://joleliwib.sncentralschoolathikayam.com/uploads/1/3/2/8/132814942/c689e0fd8.pdfIn PDF document text
    • http://files.kyleedavid.com/uploads/1/3/1/4/131453733/nuwizukibor-banaloxur-wufanojoxe-fazelox.pdfIn PDF document text
    • http://files.belmonthypnosis.net/uploads/1/3/1/4/131409009/cc8426d66f94262.pdfIn PDF document text
    • http://sutodide.bobwarrenphotography.ca/uploads/1/3/2/8/132816066/9662172.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/1/0439/6492/4062/files/rudiments_of_computer_science_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/roxexusiratifedamovulalib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/dizarepogivusaket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/94517641836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/already_one_year.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6736/5794/files/49605479682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/cambridge_pet_exam_reading_and_writing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3128/8218/files/29689001627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/31838473510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/cape_sociology_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/90732072269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/27812372649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/43643039798.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_off000085f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F4 4984 bytes
SHA-256: f8baa45e175017ff29e5e75d8af1cf4e7427330b9f6ef4cb7d70394b1c400c70
font_01_sfnt_off000096c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C8 10524 bytes
SHA-256: fb9717027d0fc1096143b7d396f8129443ebeb9246c6ed4588306b4d362c36fb

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