Malicious PDF — malware analysis report

Static analysis result for SHA-256 748094d9e37f48ac…

MALICIOUS

PDF

51.7 KB Created: 2020-10-04 06:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d605ec0ee5af23fd64762abca5ebc50 SHA-1: 5dcb481708058f54c3d3d06c1d1991fe77d084ee SHA-256: 748094d9e37f48acdea35ca7133df6eb5d1ca9012a45699cc6fac94f7b8ceabc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one of these links leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be directing users to potentially harmful external sites.

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 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/strik?keyword=spongebob+leaf+blower+episode In PDF document text
    • http://sopowe.jdbctax.com/uploads/1/3/1/1/131164250/bisarifelibal.pdfIn PDF document text
    • http://wasopa.mwdcoach.com/uploads/1/3/1/4/131407386/bizepotukox-sakevijebajoral-zuxazuremagel-pilomuset.pdfIn PDF document text
    • http://files.lindenweitz.com/uploads/1/3/1/4/131407012/domofitivewapod_wukudimoji_viposamujigaz.pdfIn PDF document text
    • http://files.roofing-waterproofing.com/uploads/1/3/0/7/130739802/602fac0495b89d.pdfIn PDF document text
    • http://files.theferntree.com/uploads/1/3/0/7/130740196/pedene_guziw_pumusuz_jalepajuz.pdfIn PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/2877373124.pdfIn PDF document text
    • https://site-1038743.mozfiles.com/files/1038743/79842234594.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/dusogobaxepugopasedo.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/dorevej.pdfIn PDF document text
    • https://site-1038919.mozfiles.com/files/1038919/diperuxiwawotolebepola.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/69737420104.pdfIn PDF document text
    • https://site-1041388.mozfiles.com/files/1041388/17900159191.pdfIn PDF document text
    • https://site-1039633.mozfiles.com/files/1039633/84026434853.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/26412047041.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/1/0437/7509/9041/files/nunakikowida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2786/4993/files/digital_swr_meter_hf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2549/8780/files/monster_hunter_world_switch_axe_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0127/8374/files/which_eddie_bauer_stores_are_open.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_off00008d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0F 5544 bytes
SHA-256: fff1f2dcb05fa17ecbbad485ea83a5794e57b9fd05fe1b31bc4d431bfe54826c
font_01_sfnt_off0000a003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA003 9912 bytes
SHA-256: 1c1719f47baa0459052cd72d697a7858db4be6cc6e099a0a3819f65543c58b10

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