Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6825ba08faf34a…

MALICIOUS

PDF

40.4 KB Created: 2020-11-01 15:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 318df86d13c5f61a09103c2baf6b4bea SHA-1: bf23d4392f33c4274ad9ab867ac0fe40a04fb3c3 SHA-256: be6825ba08faf34ab2c64747f6eada8bf5fc018fd779c69d26e459907a7397af
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a subject line mimicking an email login. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phishing lures. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=www.outlook.com+sign+in+mail
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/tuwesom_budofozuzavigu_weneleputeruza.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdf
    • https://fegixobipe.weebly.com/uploads/1/3/4/4/134467450/5603c6001e46ea5.pdf
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/gamijaravisorilegi.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f8fd9ad71d95.pdf
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/tukonu_xadateriropisa_vizumi_sabasepurolava.pdf
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8e6503b4fab.pdf
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/71daaa9725c4b4d.pdf
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/rasavef.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/22555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0507/1028/2439/files/depififozezibogufub.pdf
    • https://uploads.strikinglycdn.com/files/f123399b-6ce8-4664-92ab-f4cfa231c6ae/different_types_of_non_alcoholic_beverages.pdf
    • https://uploads.strikinglycdn.com/files/6fff380b-74e7-4efd-8c58-77f17bc4f3c7/drug_test_kit_colors.pdf
    • https://uploads.strikinglycdn.com/files/d007f1f8-22a4-43a3-9958-8982ea768bd9/11555035011.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_off00005fb1.bin
5235f17d45f87d054d5741375869457f16d13d6431de8f332d41bbabf80d9637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB1 5224 bytes
font_01_sfnt_off0000718b.bin
d1fc3bc9780c4a1196b9b15be5da6d8ab96a762f263276373b37a81d99948684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 10264 bytes

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