Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d40ec9911c0f675…

MALICIOUS

PDF

41.1 KB Created: 2020-10-28 15:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8d0c50490752e7d28856f92356563686 SHA-1: 93eb9a713e44118c4e3ea5b718650332ad0d5efe SHA-256: 3d40ec9911c0f675bdf383a60473a9b06c5519172e924bffd50ba3d3d26cb6c8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier as malicious and contains a large number of external links, many pointing to disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure at https://ggtraff.ru/aws?keyword=i+am+poems+for+elementary+students. The document body itself is largely obfuscated but contains this URL and numerous others, suggesting a link farm or SEO spam campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/aws?keyword=i+am+poems+for+elementary+students In PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/tikinapulusaf.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/gekofelosovimekagaro.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/suwuribazonabavawo.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/bawexebawakikasur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f900499f40ad.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/c673b1.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/suwoperanujem.pdfIn PDF document text
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/8271817.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/zuvakudiverawugin.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/1/0434/9313/0390/files/manual_dlink_dir_615.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/concentration_risk_in_credit_portfolios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1508/5473/files/80337978621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2305/6545/files/18235542581.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/31366031743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49dd8fb-deef-4b25-9ebc-d9a850468c67/mekinizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad40d034-8495-41f1-aadb-dc5007b5f457/88729131034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cf76ad-a8d3-4b69-8ca4-f60213651a75/book_of_mormon_student_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cff687-5b5a-42fa-a801-2fa1b3f12897/safoxoluwerudasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df84964a-37f6-4f54-8a0c-88e9abf259e3/13775140291.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/bsc_1_year_botany_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/liruxogafek.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/tepafavixepe.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_off000062b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B3 5224 bytes
SHA-256: 3274ae833da9d9a306da00c1b0dd32480294698609a6e909cb1311940ebc7fe6
font_01_sfnt_off0000746c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 10096 bytes
SHA-256: 1aabf9fc59584fbb1ab32791806233ad54d41dc2c6fb536a780ffc13861a745d