Malicious PDF — malware analysis report

Static analysis result for SHA-256 f879f5284c32b22e…

MALICIOUS

PDF

49.3 KB Created: 2020-11-04 02:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0baa9dd61d13def6901538329000c397 SHA-1: 51ea77634241c5115eefc083cf020707c7088c88 SHA-256: f879f5284c32b22e6f510b37c9c0d9ebbd246dc6870f5d68a001b97ed78bc9a8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://cctraff.ru/aws?keyword=go+pro+pdf+eric+worre`. It also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to S3 buckets. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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/aws?keyword=go+pro+pdf+eric+worre In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8706da29e4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wujodibu/jivafifojadotuwezebokowu.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/87569920074.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/ditech_mortgage_online_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/amc_appraiser_list.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/vazidolupipu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/luxewexizaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aac16e5-32fb-45c8-a634-fe05b9655191/77530063862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6209/0648/files/clay_county_ky_obituaries.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/google_apk_files_for_amazon_hd_fire_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/79407502526.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/beyond_the_boundary_light_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/pal_sports_complex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333ab8d3-e59f-4a29-9d0d-fbeec5be36a5/72342031075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7213/1750/files/an_overview_of_computer_science_sharer.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/kindle_android_read.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008d7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8D7E 18400 bytes
SHA-256: 5f8f2ef577b0da2ad3065b5f3aa7cda87e404644efdf63b783b408ea3c98761d
font_00_sfnt_off00005a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A26 4456 bytes
SHA-256: e791c5e9334197766fb95823e2d0825d6e7a50579b3ea4d770c64334b288faaa
font_01_sfnt_off00006969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6969 10536 bytes
SHA-256: dde7ee2f94cab8c959169aeeecb96c5cbc79094edd1191e7b0a1d9f09ea330ea
font_03_sfnt_off0000a9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.