Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce190322c68d7b71…

MALICIOUS

PDF

69.1 KB Created: 2020-08-31 09:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec44021e23ceae8dfa3acec4cdfbef0b SHA-1: d9088766b86dc4fae562db7155f6ea885ea210b8 SHA-256: ce190322c68d7b71a153c186ab83f2d708fecdd58bf1e77b6095ab6907fd286b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=clinical+assessment+and+diagnosis+in'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on cdn.shopify.com, including 'https://cdn.shopify.com/s/files/1/0435/4742/6975/files/gifizewe.pdf'. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains the same redirector URL, suggesting a lure to external malicious content.

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/wix?keyword=clinical+assessment+and+diagnosis+in
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/gifizewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/dirurafuzofinisavaf.pdf
    • https://cdn.shopify.com/s/files/1/0459/7314/3719/files/kotakiriloguloxogipuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/xitule.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/85701135345.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/phantom_forces_gui_script.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/usda_cold_summer_download_zip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/xowizifugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/connect_the_dots_printables_1-100.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/40977114824.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/garmin_approach_s20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5969/8077/files/90182724153.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/mofiparivenifetevaroj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/ejercicios_para_nombrar_alcanos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/87476691919.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/gusesabox.pdf
    • https://cdn.shopify.com/s/files/1/0459/6698/3335/files/3753953059.pdf
    • https://cdn.shopify.com/s/files/1/0432/9829/1870/files/53579212279.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/xewumip.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_off0000c44e.bin
34000874a74e1ed0269bc413f0369b5e0e06b839b897eb239fe95f66a0fe2e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 4972 bytes
font_01_sfnt_off0000d518.bin
9aa94666d140fe719204d9ed6edb695399cbe64a31e380756aa26659bb2adaf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 10484 bytes
font_02_sfnt_off0000f89a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 4324 bytes

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