Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c8e8a0b5084493…

MALICIOUS

PDF

54.4 KB Created: 2020-08-16 22:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72403a558ac66ab810a3daf9a5297717 SHA-1: ae9f1d85a7778d432d5822c140ba54b2f83c0d52 SHA-256: 16c8e8a0b50844937d8a9194b5858422af599d296ba613297ebc319e95564f80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the extensive link farm is sufficient evidence of malicious intent.

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/pify?keyword=cayley+transform+inverse
    • http://files.trevorflett.com/uploads/1/3/0/7/130739368/2948457.pdf
    • http://files.goldstripecoffee.com/uploads/1/3/2/6/132696210/2210397.pdf
    • http://files.corsicanaquiltguild.com/uploads/1/3/0/9/130969791/karagomag.pdf
    • http://xusud.troliosprint.net/uploads/1/3/1/6/131607163/6842335.pdf
    • http://files.gonzalescountyfarmbureau.org/uploads/1/3/1/3/131380005/filijawov_wamokinepibuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/xavijupofofozigakipopugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/user_persona_template_sketch.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/fikavedemonelafukubibap.pdf
    • https://cdn.shopify.com/s/files/1/0439/6302/3518/files/tuniw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/55315921217.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/xurisipakurizaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0438/1379/8050/files/zilunow.pdf
    • https://cdn.shopify.com/s/files/1/0429/5409/6806/files/12050737572.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/xojeduzisonarurapufuwefom.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006998.bin
5c681ba383358c0869dd5c753e7d48a613dc4daae008458f2c66005b3e3b06f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6998 4888 bytes
font_01_sfnt_off00007a26.bin
0197791da42f8387ed77b783c98f60cfa21f1ee2779ce36b36bbcfbba9855dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A26 14652 bytes
font_02_sfnt_off0000a914.bin
3199fde5fcadac7f1710548267cd11d7b1e139126945fe5aba5af00528db75fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA914 16236 bytes
font_03_sfnt_off0000be72.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 4324 bytes

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