Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d845c05a3a204…

MALICIOUS

PDF

37.1 KB Created: 2020-08-22 00:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2dd4fc677b538270e9b8cc9ec6bfa0 SHA-1: ae5510edd376ea79ba47e24567fb612d4f64fe61 SHA-256: c91d845c05a3a2046ea057b13b8905f7308d853e635c43308e5966903b807408
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=tamil+reading+practice+worksheets', is identified as a malicious redirector. This suggests the document is designed to drive traffic to malicious sites, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct payload execution.

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=tamil+reading+practice+worksheets
    • http://files.greaterniagarairish.com/uploads/1/3/1/3/131384674/f808ca2eb2554a7.pdf
    • http://files.mychairspins.com/uploads/1/3/2/7/132740638/ea6ad10000f8e9.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/election_dates_2020_schedule_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/8371083331.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/tropical_ornamental_plants.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/kilezadozedageloke.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/brew_install_yarn.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/author_s_purpose_worksheets_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/xesibezefidif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/college_application_resume.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/98015040163.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/wuvunitobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1907/5737/files/eduardo_galeano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/vanilla_wow_fishing_and_cooking_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8525/1235/files/piwifewiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/buzinupubu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e3.bin
cc2c67ebf9e88b94a5ede24477c1e6b97574cfde78a70854c1e49279a7b93252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E3 5592 bytes
font_01_sfnt_off000064c7.bin
215003749aa4979c7cc049f79034a4cfebede798ca31e8e3c6d7dccd9200985f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 10160 bytes

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