Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe7aad1e328504a…

MALICIOUS

PDF

34.3 KB Created: 2020-08-09 21:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b87a09a041c2cb292c34f76fef5c58 SHA-1: 242ef716111d61dfd80329d428924f0d4d4972f7 SHA-256: fbe7aad1e328504a071bebc3667a0b6cb3c1308a2feb1f72c3db983b33887fa9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=williams+hematology+9th+pdf'. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.ru/pify?keyword=williams+hematology+9th+pdf
    • http://files.spanishflamencodance.com/uploads/1/3/1/3/131384635/pupivofatirimikujori.pdf
    • http://files.nniggeleportfolio.com/uploads/1/3/1/4/131406369/2156953.pdf
    • http://files.renaissancephoenixptsa.org/uploads/1/3/1/4/131407047/2166004.pdf
    • http://files.moyo-up.de/uploads/1/3/1/0/131070367/114237.pdf
    • http://posuliki.rcbtr.org/uploads/1/3/0/9/130969060/7d13d67eab535ef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/apprendre_a_lire_un_ecg.pdf
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/urban_sociology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/vekida.pdf
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/zekumedunopezezizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/lizakuveketugeniridem.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/966_spreading_manure.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/java_eclipse_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pitoparejiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/fonidizurija.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/google_academico_apa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/subclinical_atrial_fibrillation_and_the_risk_of_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/5606169015.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/foditivamuwapoxipefe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004881.bin
338f0a3771a4c4f17e439a7853ede3fe2c721c0085d91b6eb2bf234a2538164f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4881 5628 bytes
font_01_sfnt_off00005b9a.bin
4117b92dc5e4afad746198dece9c8f42585a40e389907f5805a69eeafa596150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9A 9192 bytes

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