Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e734db6ddbdc16…

MALICIOUS

PDF

43.5 KB Created: 2020-11-01 23:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 230f5ee61a443006363b330664e3ab06 SHA-1: e4106194dac8acff9d4efdae8fdeb84abb5153a5 SHA-256: 39e734db6ddbdc16520e6a9fb43ab058f18f166a0422b24e8c3c19e167d44402
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to improve search engine ranking for malicious content. The presence of a 'download button' lure further supports the 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://ttraff.me/123?keyword=applications+of+no+limit+hold+em+pdf+free In PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/e524d652433.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/kufufado.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/aaf9efdb-99a4-4393-be5a-ae69f9a07045/zofutetitatanoganonofuzov.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/nowadedokibixisidigapu.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/89488533128.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/39960766912.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/fremmy_isles_osrs_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/12470755731.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/xudiras.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/oceanography_and_marine_biology_an_annual_review.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/penifolilowupadatavuju.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/jobagorewowigotugobage.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off000069d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D1 5384 bytes
SHA-256: 5a38f320e7ba44133d60e440fcba466b86820dee51395141fe6982f211440b51
font_02_sfnt_off00007bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 10752 bytes
SHA-256: 1079ee19a12bfebaf2dac1e0f7774bcf1ea61a962223c20803cf335743276184

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