Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3036caca52913b…

MALICIOUS

PDF

53.0 KB Created: 2020-11-04 16:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9c318bbfccbcdc891fbce3db1362be91 SHA-1: 3083af5022b9a300a863b604b7e5581f1ceff527 SHA-256: 1c3036caca52913b65bf0b15a3ff11c1ab87eacabb39f6770a3782c6f08c15af
134 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ggtraff.ru. This redirector is likely used to obscure the final destination and potentially deliver a malicious payload or conduct phishing. 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=kill+my+boss+cast In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukusa/affairscloud_august_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/28115161703.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/rejumejosovabidu.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/progotv_promo_code.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/bible_commentary_books.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/51006471715.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/24522378987.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/56894979566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50047eec-509f-4ef1-b902-83915e6d8ec3/senha_em_pc_summertime_saga.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/app_hack_downloader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b805bb5c-487b-437d-829d-3029f3546d7f/firehouse_subs_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6017ff24-5403-4050-9ac9-3d23dd6fce5a/86921275124.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/durijedusufolil.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/basic_english_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad52585e-20e3-4ca8-ad94-09e11cc1afdd/44048651937.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_off000091f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F8 5060 bytes
SHA-256: 1cb2d49e9adf86a17e8f3ad0657c45b41b844d74cf208fea4d0517dc101ec1ea
font_01_sfnt_off0000a329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA329 10748 bytes
SHA-256: b3bbd3abcb34c8c474d51f4e2d298625f4b53941e5c7d4ef572d6870d807a02b