Malicious PDF — malware analysis report

Static analysis result for SHA-256 1253a046efd186f6…

MALICIOUS

PDF

46.3 KB Created: 2020-08-23 21:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff36b2708bf995011b08b9d930f5dfc7 SHA-1: 908a51f04f9e9ac4a9a4798153f43ab3799779b0 SHA-256: 1253a046efd186f6f9beec91ebf8fe9fd3d99262f920ba8b97e7895b615447bf
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'f37 bolton font free' and the malicious URL, suggesting a lure for users to download something malicious. The ML classifier also strongly indicated maliciousness.

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=f37+bolton+font+free
    • http://pebule.championcleaning.net/uploads/1/3/1/3/131382134/8272b4cb409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5264/5017/files/baldrige_criteria_for_performance_excellence_healthcare.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/60002036631.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/wepowudefamenadukodem.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/zatodupoxif.pdf
    • https://cdn.shopify.com/s/files/1/0461/9108/3670/files/customer_service_associate_job_description_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/82590286311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/778227247.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/kudekuwovopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/sigimuzutulipopos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3735/9271/files/treasures_grammar_practice_book_grade_5_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/aortic_regurgitation_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3c.bin
463c7c386aa86cdea635edbdd40696c07e2a569187649d0d7347f48317080172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 4712 bytes
font_01_sfnt_off00006f6b.bin
7ca8e0616efb5522300e912ce550f670ca9ea3d7aba98c9d7568d24dca28178c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6B 11948 bytes
font_02_sfnt_off000097a0.bin
fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 16084 bytes

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