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)
MD5: 2f47018418757256529849bf44769641 SHA-1: 0376b32e7e811fb24e9043b463b2aff35698fc24 SHA-256: 5ea9b09003fc4cf97458622502f36d396e6a09c1758f96eb85e263910770ac16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. These findings suggest the document's primary purpose is to distribute malicious links, likely as part of a phishing or spam campaign.

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.cc/wb?keyword=the%20commercial%20music%20fake%20book%20pdf
    • http://files.developmentechnwkllc.com/uploads/1/3/0/8/130874064/soriz-digebud.pdf
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdf
    • http://files.dandlpring.com/uploads/1/3/0/7/130740018/f6ebf49e085.pdf
    • http://files.craftsbywayne.com/uploads/1/3/0/7/130739726/vibemibegusat_gexemupibezeg_fabotujosalidus_xalilifuzoxokeg.pdf
    • http://files.khemkhon.com/uploads/1/3/1/0/131070618/junogilaril.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/57319858027.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/89121279047.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/jejuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/nuwop.pdf
    • https://dagirufux.files.wordpress.com/2020/07/ziwudir.pdf
    • https://vetijem.files.wordpress.com/2020/07/75530809156.pdf
    • https://mijudabebog.files.wordpress.com/2020/07/50381764276.pdf
    • https://watodel.files.wordpress.com/2020/06/25871293314.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/rirozute.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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_off000091d9.bin
6a0a555a2881a4c724b972b2e2cd5c0334eff3738010ae717b871c78dcff53d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 5244 bytes
font_01_sfnt_off0000a395.bin
3c1e72ff7ad9f319be7ceef9d47459856c8dc5ba03139a2d0da3179174366af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA395 10208 bytes

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