Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b933abf3726ce00…

MALICIOUS

PDF

47.5 KB Created: 2020-08-18 14:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07021e480af7f62ddb6450cd67640e6c SHA-1: c277a95aaeaf7d9726b71d5849dd16527c35ff55 SHA-256: 1b933abf3726ce007ce637fe240d7779344ddc9bed138db80232d7487427ecc4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL (https://ttraff.cc/pify?keyword=declutter+challenge+pdf). The document body, though heavily obfuscated, contains text related to a "declutter challenge" and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The file's purpose appears to be directing users to malicious infrastructure via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=declutter+challenge+pdf
    • http://files.musclegear-asia.com/uploads/1/3/0/8/130874478/kekitovem.pdf
    • http://files.dart-bayernliga.com/uploads/1/3/1/1/131164419/vepipafejipuvosulo.pdf
    • http://files.porchlightapothecary.com/uploads/1/3/1/3/131379014/foxobetokotubado.pdf
    • https://cdn.shopify.com/s/files/1/0433/1595/3817/files/tilusedofesaroz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/handwriting_worksheets_year_5_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/14414458198.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/32973525120.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/kegatadogexazoteni.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/gowotivexosar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/49617197394.pdf
    • https://cdn.shopify.com/s/files/1/0433/6448/3240/files/tepotituj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/bohemian_rhapsody_classical_guitar_tab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006763.bin
c5616aeb24474943ed0fcc0e6f640b144caf04e4a557442825294c5e4c04d81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 5236 bytes
font_01_sfnt_off00007929.bin
3d9d0e37763925ffb0ff0361407a4ae07094c5fb6982681f67a0e7769211b5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7929 10008 bytes
font_02_sfnt_off00009b9d.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9D 16312 bytes

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