Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0ef2edbb458c1c…

MALICIOUS

PDF

48.6 KB Created: 2020-09-11 03:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3adf0df1869fd0a223ebb4aa34c7d4ce SHA-1: 2091da61152d7c09a892f1497003c54dcd7ba109 SHA-256: 4f0ef2edbb458c1c8fb51250822660dce56d51bb1b6653417fda0b94585810fe
194 Risk Score

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.link/wix?keyword=madcon+beggin+mp4 In PDF document text
    • http://files.wiregrasssmilesdentist.com/uploads/1/3/1/8/131856984/zemunedobewab.pdfIn PDF document text
    • http://files.laarmyexplorers.org/uploads/1/3/1/8/131856569/9864316.pdfIn PDF document text
    • http://tefadanod.arjayangeles.com/uploads/1/3/0/8/130814416/97726cf3b4.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/1/0432/9062/4158/files/iphone_a1332_emc_380b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/junulijumumopelami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2775/7216/files/15933654632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/zaxolamod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2456/4902/files/warranty_solutions_5_star.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/529385_6b489a46378b4f1c8dbd33a03527fa59.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/912de2_d5a2049869fe4f3c9300915b036f1764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/open_boarding_pass_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/jexesededu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/coding_standard_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0521/2566/files/bexodisilig.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00008c33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8C33 22692 bytes
SHA-256: 2bc1f7ca369a879705f97c14ac65d6916cb11dbb164e465b1ad359bc999e750a
font_00_sfnt_off000048bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48BF 3892 bytes
SHA-256: f60e496d5fabdcab15fb61caa6a6278b2e775aea35bcab2fe3640219c47a8d7c
font_01_sfnt_off000056a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56A3 5320 bytes
SHA-256: bd8c294ced19de268cc9a57c08b9a4c91028d207abed5738ed19270abcddab66
font_02_sfnt_off000068bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 11056 bytes
SHA-256: 91a47bf418658ca082be2d713e390943f62ecc1172b5fe013a3bd0e3f788aa24

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