Malicious PDF — malware analysis report

Static analysis result for SHA-256 1642f1e7172b4b23…

MALICIOUS

PDF

61.4 KB Created: 2020-08-22 02:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63472ad3c959315df186494b767bfd90 SHA-1: faa1fa5c03cd46c02ae2d40f2270c59ff7a62f73 SHA-256: 1642f1e7172b4b23b35be55825422e865a2f16c8dc9654432a03e95a527a7101
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=%25D8%25A8%25D8%25B1%25D9%2586%25D8%25A7%25D9%2585%25D8%25AC+translate+blogger+templates'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is 'http://bajal.provisopartners.com/uploads/1/3/0/7/130740073/kuwok_zezunizerir_piposu.pdf'. The ML classifier also strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, contains a URL that aligns with the redirector heuristic.

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/pify?keyword=%25D8%25A8%25D8%25B1%25D9%2586%25D8%25A7%25D9%2585%25D8%25AC+translate+blogger+templates
    • http://bajal.provisopartners.com/uploads/1/3/0/7/130740073/kuwok_zezunizerir_piposu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/rental_bond_refund_form_wa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/masajaxikimeforodevibim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gerakofidasetivivirodipel.pdf
    • https://cdn.shopify.com/s/files/1/0449/4698/1023/files/binomios_conjugados_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7739/files/charles_and_boyle_s_law_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/usarec_form_1037.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/68975879760.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/bafazikefogalipanidina.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/probability_distribution_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/set_of_integers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/19920183522.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/rekavekupipuximiwepigimo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/3777157995.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b6c9.bin
9c88015c403f0efbfbb0083399db186f607daec90d58028be5263fe1dcbf626f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB6C9 26700 bytes
font_00_sfnt_off00006bce.bin
de1aab189fa1906782484dc46f247435805f0094144253b814ada8263ca1b697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCE 5184 bytes
font_01_sfnt_off00007d4e.bin
a9c043809623e1a45e2df09938f28ce0500eb2272be35616feba24c28d01ba29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4E 16700 bytes
font_02_sfnt_off000094a7.bin
d0a08c3c120b318dac69d8895ed1418ee8406ba623532da1b29e28c9641b3307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A7 9872 bytes

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