Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fd4f303937de61…

MALICIOUS

PDF

56.3 KB Created: 2020-10-11 01:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdfff955c728f743a7f87b81c587d9e5 SHA-1: 6b1b019a953e637cfd4a6f8fce733d167574e973 SHA-256: 20fd4f303937de61b5e213c3bc0e11c0f7a90cb2384640a31ef57ccae3275a2e
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a guide. The document body and heuristics indicate a lure to click this link, likely to download a secondary payload or redirect to a phishing site. The presence of embedded URLs and the ML classifier strongly suggest malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=eve+online+isk+guide In PDF document text
    • http://files.seatoskyfit.com/uploads/1/3/1/1/131163920/soguga.pdfIn PDF document text
    • http://files.teacakeandgaming.com/uploads/1/3/0/7/130739712/6938523.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/1/0430/9617/8849/files/sight_singing_practice_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6700/2018/files/cuisinart_5_in_1_griddler_waffle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3520/9127/files/a_love_to_last_march_24_zodiac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/favorite_food_diet_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7224/5926/files/the_draco_trilogy_plagiarism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c36dda-84df-45f7-b03e-841e70796e97/refonut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4835/3959/files/sro_test_moi_ra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9477/9051/files/wopuvoxufebateru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8238/6075/files/proton_nmr_coupling_constant_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/javapewekokasubumotadi.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_off0000a018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA018 4768 bytes
SHA-256: 1a9c0aa64f51c57f9af3d89c9f11f100c4b19a09148aa698dbdca5d0adf808b0
font_01_sfnt_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 10544 bytes
SHA-256: 3d2fe87678ec3ca6c3035fc927da3900cefd965f44f5b2980ac02fb1836b3332

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