Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9a834620fcbc12…

MALICIOUS

PDF

52.9 KB Created: 2020-10-30 20:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73a3e9847a1485099a4775b1f0f7af97 SHA-1: 7b5c9fdd07326dcb86d9e3ac25ac8f0a92157cdf SHA-256: 6e9a834620fcbc126acea564cb53080c065da146ad599cc19bc4c8fc48894d88
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, likely as part of a phishing or scam campaign. The heuristic firings indicate the PDF is designed to lure users into clicking these links, which are part of a link farm and redirector infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • 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://ttraff.club/pify?keyword=dell+inspiron+3847+specs+i5 In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/paximafupiwikonali.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/98ab38d6194de7c.pdfIn PDF document text
    • https://wojawafelufofux.weebly.com/uploads/1/3/0/8/130813934/2128366.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/vuxinakasur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5f9c0654d0733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14ed479-76d7-4543-ac0d-52a3f156c9ac/52519673724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6726/5220/files/subject_verb_agreement_worksheets_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4847/1194/files/xanowanozifavubisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cba73f5-c970-4e97-82dc-2f4a18ef450c/codewars_sql_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8739/6508/files/31761003589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6658/4988/files/92001417511.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3460/5725/files/download_cheat_god_eater_2_ppsspp_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9854/5562/files/the_killer_angels_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/download_intro_templates_apk.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_off00008e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E81 5368 bytes
SHA-256: 0df41223c75b2485bd19188822f2e56616141aa764ed98d48ce0ff7e195bca8a
font_01_sfnt_off0000a0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F0 10992 bytes
SHA-256: aeecfd0dbf203754b2b2969bc4f2ac0f92c29a38e86c4161b673619416e4380a

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