Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea9b09003fc4cf9…

MALICIOUS

PDF

52.9 KB Created: 2020-07-23 05:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2f47018418757256529849bf44769641 SHA-1: 0376b32e7e811fb24e9043b463b2aff35698fc24 SHA-256: 5ea9b09003fc4cf97458622502f36d396e6a09c1758f96eb85e263910770ac16
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'commercial music fake book pdf'. The ML classifier strongly indicates maliciousness, and the presence of redirector links points towards a phishing or scam attempt.

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.cc/wb?keyword=the%20commercial%20music%20fake%20book%20pdf In PDF document text
    • http://files.developmentechnwkllc.com/uploads/1/3/0/8/130874064/soriz-digebud.pdfIn PDF document text
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdfIn PDF document text
    • http://files.dandlpring.com/uploads/1/3/0/7/130740018/f6ebf49e085.pdfIn PDF document text
    • http://files.craftsbywayne.com/uploads/1/3/0/7/130739726/vibemibegusat_gexemupibezeg_fabotujosalidus_xalilifuzoxokeg.pdfIn PDF document text
    • http://files.khemkhon.com/uploads/1/3/1/0/131070618/junogilaril.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/1/0430/9018/2304/files/57319858027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/89121279047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/jejuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/nuwop.pdfIn PDF document text
    • https://dagirufux.files.wordpress.com/2020/07/ziwudir.pdfIn PDF document text
    • https://vetijem.files.wordpress.com/2020/07/75530809156.pdfIn PDF document text
    • https://mijudabebog.files.wordpress.com/2020/07/50381764276.pdfIn PDF document text
    • https://watodel.files.wordpress.com/2020/06/25871293314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/rirozute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 5244 bytes
SHA-256: 6a0a555a2881a4c724b972b2e2cd5c0334eff3738010ae717b871c78dcff53d3
font_01_sfnt_off0000a395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA395 10208 bytes
SHA-256: 3c1e72ff7ad9f319be7ceef9d47459856c8dc5ba03139a2d0da3179174366af4