Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb8e145ab2c6a69…

MALICIOUS

PDF

43.5 KB Created: 2020-08-11 20:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394b56b87febcb9d5310533d6de2119c SHA-1: 5e6a49dfe678d990a8bdb3a16b2fb824c19d8c73 SHA-256: 8fb8e145ab2c6a699de1782f6bc4faeffcd9045c86bbe2eefa97ee84cf349d14
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the URL that triggers the redirector. This suggests the PDF is designed to lead users to malicious content through a chain of redirects, likely for phishing or malware distribution.

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=amar+chitra+katha+comics+pdf
    • http://files.capmt8.org/uploads/1/3/1/6/131606186/5aa069786.pdf
    • http://tufudogu.tymprojects.site/uploads/1/3/1/8/131871478/sukomiwevabosuropa.pdf
    • http://files.amandaprocknal.com/uploads/1/3/2/6/132683003/8524db8982af.pdf
    • http://files.ksexoticfragrances.com/uploads/1/3/1/1/131164324/c52c9f88c.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/berg_balance_test_rehab_measures.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/48734284064.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/33619176452.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/becoming_a_better_husband.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/69212023914.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/repol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/wexorizupexajagujori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66179678401.pdf
    • https://cdn.shopify.com/s/files/1/0444/4664/6439/files/atkins_physical_chemistry_7th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/19683417863.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/99262350436.pdf
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/wavefezexom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/gewimutowodowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/47994193515.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/chakli_recipe_in_marathi.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_off00006b86.bin
e26128da67be24080e7cab06ab9bcb713015b5a96017ac2fdcd406e1eb78e3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 5416 bytes
font_01_sfnt_off00007dc3.bin
5d0d8cd01a57da7225d6e447d45d770653d4ce84dec50eab95fd0eb77694de48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 10112 bytes

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