Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ebced5ea5eec13…

MALICIOUS

PDF

48.8 KB Created: 2020-08-19 13:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb2ad6d9f62c1f168d92363b472fd75 SHA-1: 6c6b1f1a31b4522f65272429aa3e9a964ab603c2 SHA-256: b3ebced5ea5eec13089117fbb8475e5f499ed152f99ec4c7fd2063ad98efa6db
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely used to obscure the final malicious destination. The presence of numerous embedded links suggests a broad distribution attempt.

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=messenger+app++apk+ios
    • http://files.cl-projects-sound-design.com/uploads/1/3/0/9/130969614/sugukosunezalad.pdf
    • http://files.stmarksumcbroomall.net/uploads/1/3/0/9/130969801/6304523.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/blanqueamiento_dental_interno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/fovozajon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/85928075939.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/monthly_budget_calculator_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/prima_de_riesgo_de_trabajo.pdf
    • https://cdn.shopify.com/s/files/1/0452/4094/2753/files/gavokolirunomusavatup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/33661553479.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/mekarumug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/calendario_2019_para_imprimir_octubre.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/82480496777.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/lifigefakixilotibox.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/vatudopifovevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5176/9256/files/o_saki_saki_video_song_hdyaar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/free_residential_house_lease_agreement_form.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_off00006d25.bin
a87db28c1222e9de9357eab8e5e6eabab2a02ce6d0e4bf8edd80a6b4abca13d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D25 5024 bytes
font_01_sfnt_off00007e58.bin
ff38044832704a0d39d16904f43d1d3e677976d2fa48e1c1370f42f83a5d5f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E58 10044 bytes
font_02_sfnt_off0000a0f4.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F4 16204 bytes

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