Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b39db55dd0466b4…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 20:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d572b5364380336007bbcb1a8add94c SHA-1: ed44fae50a67843f3801fe0fad2b599b2f25b0d1 SHA-256: 6b39db55dd0466b421bf9e96480715e0a9328f483e3232a257932e2c59502aea
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service and then to other PDF files hosted on various domains. The document body includes a deceptive title related to a song, likely to entice clicks. The presence of numerous external links, including a known malicious redirector, strongly suggests an attempt to lead the user to malicious content, potentially for phishing or malware delivery.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=john+legend+stay+with+you
    • http://files.warriorsfastpitch.com/uploads/1/3/1/4/131409526/9201649.pdf
    • http://files.nickbridwellwriter.com/uploads/1/3/1/4/131406811/tabamulumuxuzodif.pdf
    • http://files.southshoreeldercareconsultants.com/uploads/1/3/0/7/130776031/31b38c5e26842.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3438/6332/files/kifedexurotogobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/pawebolupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/xufopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41877136991.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6565/files/zofijamagiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/41640811937.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/nimawod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/77892107898.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/jabozevu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/77331571098.pdf
    • https://cdn.shopify.com/s/files/1/0432/7001/3086/files/nodegisiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96512150342.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/60640447089.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/31646847799.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064de.bin
157c50450880cf22abea599224c1a2b67ed7f860e016dc55529bbf8b8bfdaaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 5176 bytes
font_01_sfnt_off00007688.bin
0563eeae70659045b0744f2a53edfede234077a52eccb4a7c1e69c7d4b63a4f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 10088 bytes

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