Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97f844a44947ed9…

MALICIOUS

PDF

48.9 KB Created: 2020-08-19 11:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f4bcd7f02436d8190607fa1318624d SHA-1: 8adb403e485f6c1884811b97b66a8257db6df386 SHA-256: b97f844a44947ed907b4d1d1a57a142448aaf4ec1711680af78bfc04d0860004
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=sample+narrative+report+on+brigada+eskwela+2015. The document also exhibits characteristics of a link farm, with numerous links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness.

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=sample+narrative+report+on+brigada+eskwela+2015
    • http://files.mosaiqc.eu/uploads/1/3/0/7/130775715/xoxuwibenomaxilow.pdf
    • http://kanamosum.plantoprosper.com.au/uploads/1/3/1/4/131405927/88d257af.pdf
    • http://files.harmonizeyourspace.com/uploads/1/3/2/3/132302913/6922088.pdf
    • http://tanutopib.kenplattlaw.net/uploads/1/3/1/3/131380390/mupisopozad.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/21513308039.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1687/files/64039126725.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/oil_filter_comparison_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2719/files/is_tunnelbear_safe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/7941442248.pdf
    • https://cdn.shopify.com/s/files/1/0445/5625/5396/files/nursery_rhymes_for_babies.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/41173664125.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/building_construction_company_profile_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/anestesia_para_aneurisma_de_aorta_abdominal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/54654187908.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/81022461975.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/computer_age_statistical_inference_efron.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/doloviwagotul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/kajologijutekiwumojosu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071a3.bin
60fe2494fa6c3f946827d91a8c8005eaf5085d0ade04e3cbd5ff08bafcd027a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A3 5976 bytes
font_01_sfnt_off000085ee.bin
00347ffc24b35425dfa20c2f87f8ebf2cd709a68f0b51b1926f056de8e2182b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EE 9980 bytes
font_02_sfnt_off0000a82c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA82C 4324 bytes

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