Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4429ebce005cdc…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 02:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed48b2a86b464fa6fb7d4ca204ffa9ae SHA-1: 67a96c36def3c9699ac8098e14242a1a574ab8f7 SHA-256: af4429ebce005cdc5f533d29695f32adaf7ef3d85170761d3f4d3348a6191532
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a redirector service, which is a common tactic for distributing malware or phishing pages. The document body, though heavily obfuscated, contains text related to 'Cornell notes template for science' and includes the malicious redirector URL, suggesting a lure to a malicious site. 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.cc/pify?keyword=cornell+notes+template+for+science
    • http://tinuwavex.letstalknumb3rs.com/uploads/1/3/1/3/131383483/zamotofofadidukekewa.pdf
    • http://files.gmperspectives.com/uploads/1/3/1/6/131637271/tuzaniposolaragolo.pdf
    • http://files.andwhilewewait.org/uploads/1/3/1/4/131407406/425ced0.pdf
    • http://files.annebeancreative.com/uploads/1/3/2/6/132696117/b2cdafccad4.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/tomatemopoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/15638105795.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/70561846796.pdf
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/72537625703.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/rowofegowaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6398/3769/files/keynote_templates_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/xisapigalasifagogam.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/fedemadudef.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/estilo_de_aprendizaje_visual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/veterinary_anatomy_colouring_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/95436991777.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/71920155156.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/puxutexowosekulegakope.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_off00006794.bin
3652cab357e524a6f8b050db3b158129483e35d7e3ca9de0e098d54e785ddf94
pdf-font-stream PDF embedded font (sfnt) at offset 0x6794 5064 bytes
font_01_sfnt_off000078ae.bin
9a0390ccf2d2a1186da56ea030e21cdd12fb1c8d40c785fdb42109edad477a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 9888 bytes