Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e19400f19754df…

MALICIOUS

PDF

42.7 KB Created: 2020-10-09 01:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 3ab9c572c9920e8073b08efe5cc2198b SHA-1: 2a78dfe991db2cf458c3545f485c65b68e040347 SHA-256: 18e19400f19754df4261e1cd88b81d134b01fd872b958f8629c15b345aa4cb41
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results. One of the primary links redirects to a known malicious URL, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/pify?keyword=kuna+middle+school+bus+routes In PDF document text
    • https://site-1043088.mozfiles.com/files/1043088/7488609913.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/85067868733.pdfIn PDF document text
    • http://files.blackdalhiaarts.com/uploads/1/3/1/0/131070751/xudobekudutukiludaxa.pdfIn PDF document text
    • http://nebijin.commonclimber.com/uploads/1/3/1/0/131071297/porakepikolil-sapajijaf-xiwila-kibewosegogev.pdfIn PDF document text
    • http://kumelodix.dbicc.org/uploads/1/3/1/4/131438268/farixurazeluba.pdfIn PDF document text
    • http://moxadupan.menchavez.com/uploads/1/3/1/8/131871781/jakupir_pidutipona_robedujav.pdfIn PDF document text
    • http://mativub.villatesoristjohn.com/uploads/1/3/1/4/131453943/fujexunawetiwewoje.pdfIn PDF document text
    • https://site-1043445.mozfiles.com/files/1043445/83082128912.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/wumime.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/1/0434/9332/7008/files/biology_cell_structure_and_function_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/tunosomijigef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/lightning_and_the_sun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2232/2328/files/geneva_watch_price_in_philippines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/16092689792.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_off00006a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A04 5288 bytes
SHA-256: 2e15bb77c4a92e806f2f875895e18ec40c202bd09acc82891d95c7ae835b7c50
font_01_sfnt_off00007bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD8 10084 bytes
SHA-256: 8cfad4623a7f309b13a95a93d9e398c85f0bd0cc96ccdf816a5a135c502e7b82

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