Malicious PDF — malware analysis report

Static analysis result for SHA-256 87954f3295c3be3b…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 02:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4941b8c03deacbb2aa1875acf678af82 SHA-1: fa7854b16a03db6fe30d903be89a050d1a398d12 SHA-256: 87954f3295c3be3b2e719ad90b9c665ad82da4cef14a258720b6c9329e184554
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=kalender+2020+pdf+gratis', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'Kalender 2020 pdf gratis'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=kalender+2020+pdf+gratis
    • http://files.jtoppbecker.com/uploads/1/3/2/6/132682684/4284736.pdf
    • http://files.mindfuldoodles.com/uploads/1/3/1/4/131414743/1126048.pdf
    • http://files.poetsanddreamers.com/uploads/1/3/1/4/131407135/faxapajavov_palevolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/43430348655.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/bewizobagavezuvovatesig.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/93553584759.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/java_ldap_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/rodrigo_silva_o_ceticismo_da_f.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/ocean_avenue_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/woboxatojunagubelisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/common_math_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/44516550497.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/26047478140.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/28948712586.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006329.bin
0ab018082dba6accf02dac837a4eb3eb5ba1a8e8f75b67a0250ebac016f9d0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 5128 bytes
font_01_sfnt_off000074a5.bin
699f55fa87fa67447b3a56f2f3c5fadf1447dd04390ebe21412dccbbb99ec12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 11244 bytes
font_02_sfnt_off000097e8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 4324 bytes

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