Malicious PDF — malware analysis report

Static analysis result for SHA-256 2256631b4acbceba…

MALICIOUS

PDF

54.4 KB Created: 2020-08-29 10:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6001f6d8bfea4e07ec95cb568914db4 SHA-1: a5703e1924cfe037db21728c20db5ee28475efcd SHA-256: 2256631b4acbceba53f3c59ccba8bdf0170d85904a79aeca7f63a6c6955da466
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to 'electric circuits 9th edition soluti' and the malicious URL. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with the primary one leading to a Shopify domain. 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/wix?keyword=electric+circuits+9th+edition+soluti
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/jabarufuker.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/82415491970.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/biological_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/social_media_platform_user_demographics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/scholastic_aptitude_test_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0452/3845/2381/files/microbial_analysis_of_sachet_water.pdf
    • https://cdn.shopify.com/s/files/1/0436/5379/1909/files/free_amritvani_ram_sharnam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/rigufofuvugelaset.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/46887393517.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/91124586636.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/67801996175.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafa41c826854254940890c10bed8360.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b50c75b0c4f4e008c3dbcb52dc4e5cc.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_off00009856.bin
ab04cfa03846bba7599dd77fc69ef6c10c4a43216e27847b4989a1156299a9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x9856 4928 bytes
font_01_sfnt_off0000a90d.bin
2028a33dc7c800c53ad154c7b31c5e6de6b6e9265f70f99f2d6353565159b007
pdf-font-stream PDF embedded font (sfnt) at offset 0xA90D 10348 bytes