Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e798cc181e94e2…

MALICIOUS

PDF

45.9 KB Created: 2020-10-09 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68f834ce2c20892b5833f63086f173f5 SHA-1: f279c338d1f49639b97f8364c48f0d237ece0fc1 SHA-256: f8e798cc181e94e250165dfedd6faf0eb4cb480ae403f40d34c6a1c8f76d09d0
154 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 are structured to appear as search results for a book title, but redirect to potentially malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are part of a scheme to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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 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.
  • 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/strik?keyword=chapter+20+to+kill+a+mockingbird+answers In PDF document text
    • http://files.brightskyacupuncture.com/uploads/1/3/1/3/131379873/tunetowuvuku-degolazidiwab-zefevalomitek-gatopesesebexe.pdfIn PDF document text
    • http://files.facemasksforbusinesses.com/uploads/1/3/1/4/131437147/beseverutetobawivaxi.pdfIn PDF document text
    • http://gavuve.h-dmanagement.com/uploads/1/3/1/3/131379510/boguwik.pdfIn PDF document text
    • http://sabeve.whatatimebeachhouse.com/uploads/1/3/1/4/131437299/ef7b43876c650d.pdfIn PDF document text
    • http://files.dytrivia.com/uploads/1/3/1/3/131380337/zabexusizexotur_teparejomono_fuvob.pdfIn PDF document text
    • https://site-1040798.mozfiles.com/files/1040798/43005528069.pdfIn PDF document text
    • https://site-1043833.mozfiles.com/files/1043833/55329564825.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/jabokofomesasom.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/buzipabajupizasizig.pdfIn PDF document text
    • https://site-1040084.mozfiles.com/files/1040084/51392703858.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/20498554390.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/85870510713.pdfIn PDF document text
    • https://site-1037859.mozfiles.com/files/1037859/wedevafogumura.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/korimaxojinubeg.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/1/0430/8910/0951/files/chalice_dungeon_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/womens_lacrosse_rules_for_dummies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5305/1815/files/jodi_arias_letters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1077/2125/files/dog_barking_at_night_police.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3266/9081/files/mitivekexonipiba.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_off0000761f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 5964 bytes
SHA-256: 58ceb89c83dc37fd9ef73e8cbac81acdb798d865467fcea3ea9d11446ad7e9b9
font_01_sfnt_off00008a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3B 9416 bytes
SHA-256: b124c07480e3c03e4e13ecd4f71773f08276ad3651148b89da225511adb984c6

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