Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e829bda8e1f594…

MALICIOUS

PDF

45.6 KB Created: 2020-08-15 01:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da41e8cf943c2d6721f14acc403cde44 SHA-1: 8d3824e31b2fe46fcf0c138c18f40cea03695110 SHA-256: 99e829bda8e1f59437fce77c88381bceb0bbcb120a44440ab797afbb74b50e9f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=acentuadores%20de%20sabor%20pdf'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier strongly flagged this PDF as malicious. The presence of multiple Shopify URLs, some benign and some unknown, suggests a potential attempt to blend in with legitimate content while hosting malicious redirects.

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.cc/wb?keyword=acentuadores%20de%20sabor%20pdf
    • http://files.traditionalwellnesscenter.org/uploads/1/3/0/8/130874316/3dd5aff568.pdf
    • http://files.nlistudiosla.com/uploads/1/3/2/6/132695576/20fe53b272a6.pdf
    • http://vorumud.lacanaotrashierbas.com/uploads/1/3/1/3/131380005/dumopusu.pdf
    • http://files.thehomebodymum.com/uploads/1/3/2/8/132815854/2533a.pdf
    • https://cdn.shopify.com/s/files/1/0439/4565/6488/files/25823196237.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/solar_eclipse_and_lunar_eclipse.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/tanixebosavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/six_records_of_a_floating_life.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/pdf_biology_class_11_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/pigaweloxirobavuvonisonob.pdf
    • https://cdn.shopify.com/s/files/1/0448/0358/8258/files/casamento_divrcio_e_novo_casamento_hernandes_dias_lopes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/anandabazar_patrika_today_news_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/tolotikumefefabofalevur.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/xezas.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/54483305339.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_off00007533.bin
e51fecc7f9f88ad4e64c4aad8f0f21b8b393525f998b6e2cad17c3cde64a6084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7533 5248 bytes
font_01_sfnt_off00008709.bin
0e10dbfd76acd1d5aedf64a54775677a6ba95e7b13eb123c033a0c87eea1e221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8709 10152 bytes

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