Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb40e90b6d655aa…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 18:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa06a15b2ef3e8847067e60a85e225b SHA-1: 778aea15faca174d5f4610e1b2b983b944c5de21 SHA-256: cfb40e90b6d655aa6e9da04bb0a1153446f5545bca6436a6d81658680e532c31
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=fairtex+boxing+glove+size+guide, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=fairtex+boxing+glove+size+guide
    • http://tenet.howdiebrownies.com/uploads/1/3/1/0/131069839/jukinunigapi_faruzujegeta_kasoperutizaput_soguzub.pdf
    • http://files.alexjbass.com/uploads/1/3/0/7/130739678/mamaler.pdf
    • http://files.trinasstitchery.com/uploads/1/3/2/7/132741149/jebijeb.pdf
    • http://rubilo.agbio-inc.com/uploads/1/3/2/6/132683130/316ed0b4faced.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/1968_cadillac_coupe_deville.pdf
    • https://cdn.shopify.com/s/files/1/0449/8276/3679/files/casablanca_as_time_goes_by_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/wewolutedabulidesarizema.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/apj_abdul_kalam_books_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/sample_conclusion_lab_report_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/career_decision_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/lititz_pa_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/free_peachtree_accounting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0462/6694/1591/files/nasogastric_tube_insertion_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/kuvudibenelavugeburo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4679/files/5840785881.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/simagofejokerobevuvugan.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/58004831818.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_off00006d1c.bin
300b61d1fa7413ab6f5f7c6ae56fbb9c135f5dd8d361ff0a382dd5ff33954ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1C 5268 bytes
font_01_sfnt_off00007f21.bin
b1f3a4e19a4aaf8da2c94349462e0ca2c0255ba54fb7d6de3da5b3f8812a0571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 10064 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.