Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4797fdaa0d387df…

MALICIOUS

PDF

46.6 KB Created: 2020-08-31 13:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf8eeb0430e15bba969d4555e61168b SHA-1: bf3939c740f03e8e63347bcf217cf4a266b41973 SHA-256: f4797fdaa0d387dfdb815dde7572d480d0121462041e61113de813b3ec762921
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link. The embedded URL 'https://ttraff.cc/wix?keyword=informacion+de+los+bosques+de+puerto+rico' is a primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the same malicious URL and numerous other links, suggesting a link farm or redirection strategy.

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/wix?keyword=informacion+de+los+bosques+de+puerto+rico
    • https://static.usrfiles.com/ugd/3e9e83_436b562cf0bc4505804ae62198c3b5de.pdf
    • https://static.usrfiles.com/ugd/38eac1_f799b6f456db4fe5ae5a64efc580ab14.pdf
    • https://static.usrfiles.com/ugd/b8c837_fad2644dde6c416dadeb2f417ec578bd.pdf
    • https://static.usrfiles.com/ugd/6f58fb_b604063fc22a43cf838c865e50159191.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/b._sc_mathematics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/albert_camus_l_etranger_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/adding_and_subtracting_polynomials_matching_activity.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/ronubutegixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/filokemojudanuludogafe.pdf
    • https://cdn.shopify.com/s/files/1/0460/8675/0372/files/how_to_highlight_in_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4536/files/klasifikasi_tanaman_binahong.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/69273507661.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/aprender_alemao_basico.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/fopononeg.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_off000067e6.bin
a9b22f128d5e6fa8082254124f09afcfb7748ef72f8bc466ada26855183e1c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 5388 bytes
font_01_sfnt_off00007a05.bin
371ce084e5ed8faca0261188005306f0f9ff265a0abb54e575137abf5ad26ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A05 10888 bytes
font_02_sfnt_off00009d94.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D94 4324 bytes

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