Malicious PDF — malware analysis report

Static analysis result for SHA-256 54748e77d48dffa3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-13 22:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70e4d7e0bfb69da2ad19f8567e2f2a7 SHA-1: 1b005dbc918d993673fa42af874cbc1ea4ecac63 SHA-256: 54748e77d48dffa34b4fe45128380df4b21924160e6a1cb7514cb941e2c44e14
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links, many of which are hosted on Shopify. A critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=girl+guides+uk+promise+and+law'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be a repeated URL, suggesting it's primarily a vehicle for distributing malicious links rather than conveying legitimate content.

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=girl+guides+uk+promise+and+law
    • http://files.chinherr.com/uploads/1/3/1/6/131606822/7465378.pdf
    • http://files.jairobanuelos.com/uploads/1/3/0/9/130969755/8814480.pdf
    • http://zuzidab.alexandramcintoshlaw.com/uploads/1/3/1/1/131164250/8061407.pdf
    • http://files.bayareasurgicalmission.org/uploads/1/3/1/6/131636954/votudex-juwuxova-guxajodura-mezinajebegotib.pdf
    • http://files.duidelijkengels.nl/uploads/1/3/1/4/131438641/bebijovojow.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/dipuxusoj.pdf
    • https://cdn.shopify.com/s/files/1/0454/5744/0926/files/emotions_circle_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/anatomy_and_physiology_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/nixevonadorapon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/dabajidoban.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/kopovow.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/tratamiento_cancer_de_mama_triple_negativo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/webini.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/longman_writer_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/18418224101.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/comment_fusionner_des_windows.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/malaria_treatment_failure.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_off000060b4.bin
50e8b10033b10b6160055e59df2d5d18eba11cffe75777ec6941f69ffc8de55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 5468 bytes
font_01_sfnt_off00007345.bin
bebd3a31a969756a3be69bda78bf007d2b7e095324f5dcb204870a069279eb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7345 10204 bytes

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