Malicious PDF — malware analysis report

Static analysis result for SHA-256 652aa78fa7a1e2af…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 05:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2a92f4465f8b6444d2b3a62ee74b733 SHA-1: e028a430ed9206394ba5890850b60801ad16cab6 SHA-256: 652aa78fa7a1e2af6af7f3882196e4dafbda4c61f9bc8be02326f92421429af4
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a search result for a calculus textbook. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, suggesting an attempt to trick users into clicking the link.

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.me/wix?keyword=apostol+calculus+vol+1+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/1285/2632/files/bls_training_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/pifonavefibutejasejad.pdf
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/auditing_and_attestation_cpa_books.pdf
    • https://cdn.shopify.com/s/files/1/0450/4682/5110/files/anatomy_drawing_school_animal_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/demokratis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/tezopiwefafune.pdf
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/17552533180.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/internship_certificate_template_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/apunkagames_god_of_war.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0632/files/network_layers_and_protocols.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_c60eefb0650e44aa9c205a765896f83a.pdf
    • https://static.usrfiles.com/ugd/ee4a13_a783619563bc48ad8eba544271771f3b.pdf
    • https://static.usrfiles.com/ugd/837d34_5d022d0bf6204f0e8e563bd84fb8a99a.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/gogaxeresedag.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/tiwevelijizajosajexoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/92810881553.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/62923096566.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b8.bin
ec27c9695d17c84d4f6efee88a5cd8b18518e8c24a6e3a3812b5ca31d903130f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 5152 bytes
font_01_sfnt_off0000785f.bin
90179f4b2a84605b392f4f88b2f5b0539643211ce15ce2efd7c158d56f9c7eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 13056 bytes

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