Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b59d1d69655f577…

MALICIOUS

PDF

77.4 KB Created: 2020-08-13 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ae9975d9787db1c330b5bf9aa98b7d8 SHA-1: cffb533de4d87a2738e3eb339af9bc3072ec0d99 SHA-256: 7b59d1d69655f577927a5a5523b788ecf5509dd32a654424002b371dc93ee960
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wb?keyword=100%20ideas%20de%20negocios%20para%20emprender%20en%20internet%20pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure related to business ideas, and the file was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external PDF links further suggests a link farm or redirection attempt.

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/wb?keyword=100%20ideas%20de%20negocios%20para%20emprender%20en%20internet%20pdf
    • http://xarinefaj.westernfamilyfarm.com/uploads/1/3/1/4/131453494/xezenazevob-wipofivajiliv-filujozubutaz.pdf
    • http://files.tutorvirginia.com/uploads/1/3/1/8/131871907/4529634.pdf
    • http://nadet.snapdragonphotographymd.com/uploads/1/3/2/3/132303382/suregepe.pdf
    • http://files.rebeccakallies.com/uploads/1/3/1/3/131380728/8174588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/gutapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/kozasorodevufikino.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/35400923001.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://cdn.shopify.com/s/files/1/0429/0428/9439/files/gomoxivarirofelogixeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/japutedisizisazuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/bonerura.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/spatial_database_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/git_pull_overwrite_local_changes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/atkins_fisicoquimica.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_off0000f103.bin
70b2392e4a5e404fcf593b93af2bc2d99cd000067f0c2e9ea2a18ed6e17a7bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 5544 bytes
font_01_sfnt_off000103bb.bin
cd5106cb8561c7c49dacdca86637a10162eb819991070bd1bf8a7474d5843e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10652 bytes

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