Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4b172027f0bea9…

MALICIOUS

PDF

47.6 KB Created: 2020-07-08 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e847a4093af092993b1017e14bfa0d SHA-1: 3c177c0b94b9b138c3c2ce8f9cc8f8482be56246 SHA-256: 7c4b172027f0bea9ce83ec5db2338f56e913b9c1b0931cecd8128c01df321ad1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, including a known malicious redirector, designed to lead users to external sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=acoustic%20trauma%20pdf
    • http://files.vertexcommunicationsinc.com/uploads/1/3/0/7/130776698/nefigesemajaxap.pdf
    • http://files.thecovenantschristandyou.com/uploads/1/3/1/3/131379434/94345039.pdf
    • http://files.lisamccafferty.com/uploads/1/3/1/3/131383664/bamibitamurata.pdf
    • http://files.letspaintarabic.com/uploads/1/3/1/3/131379612/22ab9b14a11.pdf
    • http://files.wlcbands.com/uploads/1/3/1/6/131607712/2769e0d94.pdf
    • http://files.ewiechart.com/uploads/1/3/2/3/132302913/gomokiwu-dapewijutufose-jofumuvusu.pdf
    • http://files.azkillerbeessoftball.com/uploads/1/3/0/8/130874518/jemizip.pdf
    • http://files.princetonrescue-edu.com/uploads/1/3/0/8/130873907/5839512.pdf
    • http://files.credorecoveryministry.org/uploads/1/3/1/1/131164204/vitefadimivu.pdf
    • http://files.guyingram.com/uploads/1/3/2/6/132681596/3295852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ruxejetufe.files.wordpress.com/2020/06/53128587783.pdf
    • https://jekokugin.files.wordpress.com/2020/06/90071254977.pdf
    • https://zetirufim.files.wordpress.com/2020/07/talajibatajedemoratufoxe.pdf
    • https://vomibomuso593992328.files.wordpress.com/2020/06/kezovawuvadufevusewese.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.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_off00007e3c.bin
c4671eede1f84cc79d35fd41806793e0111501ea0ccc8ab4c07485a2c1ac0be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3C 4916 bytes
font_01_sfnt_off00008ee9.bin
9d164bb17d4484651987bf46cee11ddd5fab05a483a81692ad47cd52dc4aaca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE9 10140 bytes

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