Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96d9025d2d7ad36…

MALICIOUS

PDF

60.5 KB Created: 2020-10-16 00:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5113d3f9123296ceac27d9a78912b6d SHA-1: e2e634c6464deeee6a806e042147b4d539734efe SHA-256: b96d9025d2d7ad36972356da125de720c253a0c221561dfd473c257413695164
184 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create a link farm, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'latest android update samsung s8', suggesting a lure to trick users into clicking the malicious link. 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://ggtraff.ru/123?keyword=latest+android+update+samsung+s8 In PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/e276efd25922.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/mijanepenomiketuros.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/zoselapageve.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/zipape.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdfIn PDF document text
    • https://site-1043117.mozfiles.com/files/1043117/wokumoluje.pdfIn PDF document text
    • https://site-1044515.mozfiles.com/files/1044515/69260359408.pdfIn PDF document text
    • https://site-1039725.mozfiles.com/files/1039725/jakibaji.pdfIn PDF document text
    • https://site-1042198.mozfiles.com/files/1042198/how_to_disable_messenger_app_on_android.pdfIn PDF document text
    • https://site-1043098.mozfiles.com/files/1043098/92456473036.pdfIn PDF document text
    • https://site-1039830.mozfiles.com/files/1039830/sukisurapupobimuj.pdfIn PDF document text
    • https://site-1039446.mozfiles.com/files/1039446/31704456896.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/1/0432/0306/8068/files/20695072365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4423/7223/files/star_wars_edge_of_the_empire_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5179/0748/files/coin_locker_babies_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458e5385-de72-47bc-8706-c703a583a861/36248984515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f66ea4-3a4d-4bad-a08f-7427a3850037/22672266185.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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 5384 bytes
SHA-256: 03f2a6bd9d5dd27d0473a17f1dedc420b48b66c1922c41e9b98611b7aaaea95f
font_01_sfnt_off0000bfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 10816 bytes
SHA-256: f1640e1bd530b610b99b0202ba294bdc6c6cefb7c5752548acf5f578226cf325

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