Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43135fb90b15710…

MALICIOUS

PDF

34.6 KB Created: 2020-10-04 06:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c778d474e115d5d9ce60a417ecdcfdcb SHA-1: 0cc316e8df7441ece1aec52b7217cb239390a120 SHA-256: b43135fb90b15710ffd6e6b9f07899cb5c64864914121773645c655b34a932d2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious infrastructure, specifically a redirector service. The document body, though heavily obfuscated, contains a URL that matches the one identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This suggests an attempt to lure the user to a malicious site, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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://ttraff.link/pify?keyword=amoeba+sisters+autotrophs+and+heterotrophs+worksheet In PDF document text
    • https://site-1039813.mozfiles.com/files/1039813/20776074759.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/15574364265.pdfIn PDF document text
    • https://site-1039668.mozfiles.com/files/1039668/77564106028.pdfIn PDF document text
    • https://site-1036626.mozfiles.com/files/1036626/20186650515.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/beboz.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/kodemeva.pdfIn PDF document text
    • https://site-1037829.mozfiles.com/files/1037829/vedexisivow.pdfIn PDF document text
    • https://site-1037163.mozfiles.com/files/1037163/83001977018.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/ridotimulejipik.pdfIn PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/6073552492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d5a786-c861-4d3a-9065-bb1506e9bab0/vuninulegorapere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e71ca06-493a-41ba-be37-a4f8bb0f7686/33996032974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a227b3c3-0b6d-4ad5-91e5-3660449c5217/21117480380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04aa54f-a39f-4115-ac75-de9923a25005/bidowetixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/gandalf_the_white_staff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/40022760794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/11_leadership_principles_army_jrotc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3343/4011/files/citra_fire_emblem_awakening_settings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0639/7086/files/pre_calculus_workbook_for_dummies.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_off00004b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B23 5452 bytes
SHA-256: 917b7159820ae74d0edc60affe5c0c4c516c637887bede6d02eaf390e05feb3c
font_01_sfnt_off00005d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D89 9212 bytes
SHA-256: 39220a213bc24829ae28949c61d6bf19ce001487e12a74fd29d0ccbeaa653a36

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