Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d9e0d392ce6af6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 03:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 985a9ac2e3146a948e6a4fd500a9ffbd SHA-1: 561cecac80e4d58b64c92ee1f70f009e639e974a SHA-256: 71d9e0d392ce6af6a822fad4d9e68b3981b16c1d682c3eccfcc9884d2ded17d1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs, characteristic of a link farm. One of these links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=5+pointed+origami+star+pdf
    • http://files.riverdeltaresort.com/uploads/1/3/0/7/130776371/5ebacf941e.pdf
    • http://kuwabonus.iscopesgw.org/uploads/1/3/1/4/131406149/2682211.pdf
    • http://files.theloopdeloop.com/uploads/1/3/2/6/132680905/tufom.pdf
    • http://parosag.justcruisingequestriancenter.com/uploads/1/3/1/3/131379732/1619611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2141/7123/files/44211795624.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/mcpe_block_hunt_servers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/sinepavogoxukolada.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/jesse_mccartney_leavin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1935/files/kuzajuvexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/56366575308.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/jitiginesotanazijis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/kovipefodabow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/84810901018.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/pinowakimerogapitijebame.pdf
    • https://cdn.shopify.com/s/files/1/0436/6699/7398/files/72362757720.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/45514735763.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/19741688395.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/nozelame.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_off00006fbe.bin
3f66a02756f487d136613bd50b7f6480de37a9956cb7a09ce32e3562c79ff0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBE 5360 bytes
font_01_sfnt_off000081db.bin
7fedfc041ce218be15cdd14c5a7f6557444a2288a0f379ef6e92932478d7aff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 10420 bytes

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