Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30d34a44b6c70fd…

MALICIOUS

PDF

70.3 KB Created: 2020-10-31 06:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7f8dae948c1fbd96cc088d32daaf073c SHA-1: d867a2f12c29b6f949e4d2fc323e44fccbecd958 SHA-256: a30d34a44b6c70fdef7a9b6d0de9f20ee5087e700ab8b5fb4af58dd1de57223e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://gettraff.ru/aws?keyword=monohybrid+and+dihybrid+crosses+worksheet+answers'. The document's content, presented as a worksheet answer key, is a lure to encourage clicks on these malicious links. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?keyword=monohybrid+and+dihybrid+crosses+worksheet+answers In PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/de777a42efa44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f90ab3e218f2.pdfIn PDF document text
    • https://dudererojafa.weebly.com/uploads/1/3/4/3/134362298/10d8bc.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/9078787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f9884039732e.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/8249825.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/ginutu/health_and_physical_education_book_class_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b24f7c2-7dcf-4624-aa56-e93c383b42ae/solucion_cubo_rubik_20_movimientos_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affc218d-1101-432d-b390-03d2e3d674e7/country_justice_revenge_of_the_rednecks_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e1c27e-7a32-4271-905f-6b318c7a6466/lapovawemifefuwisobil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b00991c-180e-497a-a0f9-6519e623dc7d/tojulerituxomavufuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1941/1878/files/33315332362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/1405/0720/files/herpes_simple_tipo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e2b3ab-d3c4-4bc2-a14f-98d5110a2bfb/69836333202.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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 5400 bytes
SHA-256: 01246fb7f6bf05197764ad4cc85e861bb2ed3373124af00c80e20407ceb0769b
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 11180 bytes
SHA-256: 4deea8e040e5a696045fd72eea555375e07d0774a16c8069c4c151f6d3c1b70a

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