Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ec6fab5c4ef5b…

MALICIOUS

PDF

45.9 KB Created: 2020-07-09 15:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5010cb79c1e6aef05fc38ac0304c2269 SHA-1: c854318df2d24f781f053c3a33f9bce88eecb828 SHA-256: 0b8ec6fab5c4ef5b7e2da951f83e2198a61a161fb54115a2422a9eb503ebf040
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One URL, https://ttraff.com/wb?keyword=powerpoint%202013%20tutorial%20for%20beginners%20pdf, is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. No scripts were extracted from this sample.

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=powerpoint%202013%20tutorial%20for%20beginners%20pdf
    • http://files.thepavlich.com/uploads/1/3/0/7/130739809/2114141.pdf
    • http://files.sanctuaryaplaceofrefuge.org/uploads/1/3/2/7/132710671/5422608.pdf
    • http://files.danscentrumnorr.com/uploads/1/3/1/8/131857690/5075634.pdf
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdf
    • http://files.rosemartinecreative.com/uploads/1/3/1/4/131407530/3db789d63a8dc.pdf
    • http://files.alissaellisphd.com/uploads/1/3/1/4/131452827/844207.pdf
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdf
    • http://files.bonetactical.com/uploads/1/3/1/0/131070045/1605116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://norolaxuse.files.wordpress.com/2020/07/zefomalisiminudojupol.pdf
    • https://womimoxik.files.wordpress.com/2020/07/95359185849.pdf
    • https://morumekifos.files.wordpress.com/2020/06/66850214846.pdf
    • https://waxukuvovatu.files.wordpress.com/2020/06/7910426221.pdf
    • https://lirizokese.files.wordpress.com/2020/06/navelewafatanosejax.pdf
    • https://bamidepe.files.wordpress.com/2020/06/8276449546.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rajijabobuzev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.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_off000074ee.bin
8b6c0a2aa955669ac39fe75e30667da5d875da2218cce4794f6500794955b02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EE 5812 bytes
font_01_sfnt_off000088cf.bin
52656f3fd822f474a253729cdbdd12e607e2dc294e3d924f7d63515a74b018fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CF 9796 bytes

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