Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9324c6a5e2432d…

MALICIOUS

PDF

52.8 KB Created: 2020-08-06 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd86b523c73d21730567125516a73cc SHA-1: a767d7c691ff43bed1ce03393c88ff1f90385ed3 SHA-256: 9b9324c6a5e2432d961ae135bc557a5d5ef43746f67f6130ca2840e9903d82ce
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to ttraff.com. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to project documentation. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=airline+management+system+project+documentation+pdf
    • http://files.mattrealty.org/uploads/1/3/1/4/131453215/142b19e.pdf
    • http://files.itfcwomen.co.uk/uploads/1/3/2/6/132681294/2077720.pdf
    • http://files.georgeellis.co/uploads/1/3/1/1/131164048/lemobigivesopoti.pdf
    • http://files.mrjbake.com/uploads/1/3/0/8/130874594/3200957.pdf
    • http://files.jennysparrowworks.com/uploads/1/3/1/4/131406435/533ebe74907f5.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/76065229933.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/16020538456.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/77509932164.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/53392131977.pdf
    • https://cdn.shopify.com/s/files/1/0433/6196/0091/files/fugule.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/logback_test_xml.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/dalazegopadikimatisowi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/the_bases_of_social_power_french_and_raven_1959.pdf
    • https://cdn.shopify.com/s/files/1/0432/0165/9043/files/46176756097.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/tawefazodatabazego.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_off00009084.bin
50ef25c1ed9d8d6183802338813ea5b23a2d5dc54281d2586a9a315535aade70
pdf-font-stream PDF embedded font (sfnt) at offset 0x9084 5644 bytes
font_01_sfnt_off0000a3ad.bin
1305864fa5940c2dc9f530e5a5671d0c34d41bd3abb990ee7ea08640bd13a6c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AD 9980 bytes