Malicious PDF — malware analysis report

Static analysis result for SHA-256 538c0e6d94ae6632…

MALICIOUS

PDF

36.2 KB Created: 2020-10-29 06:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4845f7878b92f2aa3ed7cf25aca6a857 SHA-1: 9f357ab861c5eca051e093da2e0c28865c2ba768 SHA-256: 538c0e6d94ae66320fb67c87180acfd811ac120b3a74fab88d212a60b185cb8c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a search query, suggesting a lure. The presence of numerous external links, many pointing to PDF files, indicates a link farm or SEO poisoning attempt, likely to drive traffic to malicious 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 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://gettraff.ru/123?keyword=washington+end+tables+by+breakwater+bay In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f90fe59acbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8e39a792705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f89631565bf3.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/1/0481/3710/9671/files/ac_tech_drive_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/best_goal_live_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/free_vpn_apk_download_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10144aa5-f176-47c2-9cab-9aa3f2b57ecb/96651499358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/53010795880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2777/1804/files/kezeposuduromajemuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3bf02f-51ee-4687-8ed5-23d8c966f80e/66052012072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6178e73c-f0f3-48ef-a028-33fa03f098d3/kiwejodizurekuxuninag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5762ee17-f828-494d-bf03-096164cde5c7/86933228974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/tutu_vip_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/zebra_striped_whale_flavors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/59360120744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/watercolor_artist_magazine_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4984/3868/files/nevolunonujovuvabunumem.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_off00004dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAC 5496 bytes
SHA-256: 6a06505734776d682fd2db2d71343d615de3e137400c3922ac2408f2150568cb
font_01_sfnt_off00006073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6073 10240 bytes
SHA-256: 79312dede765799b474e9473ed338896b84bfbf0b6310fa8dc0851a00f37c7a0

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