Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2aae4a2f041574…

MALICIOUS

PDF

41.2 KB Created: 2020-10-16 07:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6507ca610702996266db123ba71e79bf SHA-1: 79f3554cf4a25a62532e335256afe36b12f88836 SHA-256: dc2aae4a2f041574459f03ffe080165a4253319af9ede6b24aa08c290fd0239d
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of links to known malicious redirectors confirms a high likelihood of user redirection to harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

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://ggtraff.ru/wb?keyword=a%20post-%20closing%20trial%20balance%20will%20s In PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/118832.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zuvefusu_tewojawowebav.pdfIn PDF document text
    • https://site-1043475.mozfiles.com/files/1043475/jidusatu.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/pebirazugajivikagu.pdfIn PDF document text
    • https://site-1043599.mozfiles.com/files/1043599/nugexitalesujixezo.pdfIn PDF document text
    • https://site-1048531.mozfiles.com/files/1048531/upper_gi_bleeding_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f87842d52917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8723121386e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f8907bfa800c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f890ed65914c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f88bdb0ef52e.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/1/0484/4316/2778/files/26681135193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8986/9991/files/tavogexin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/sandhoke_early_college_high_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c887740b-3c97-42d2-bccd-d05ab3495d60/70795632418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb601a4-b249-4ad7-a907-285039290750/6310186883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0364/0990/files/8336267088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0548/3942/files/1932_plymouth_coupe_value.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3896/6438/files/66739715365.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_off0000624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5356 bytes
SHA-256: c2a616265c3e7099d5ee6ba3b5fc92054477646e99cd627c4f95237b45856ef0
font_01_sfnt_off0000749e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 10152 bytes
SHA-256: 8ca4e4a1387f67a9d442b90e9abacf5c1488ecf6cdb906aa0cbb0072c15611bf

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