Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb4578e1a46a68f…

MALICIOUS

PDF

37.1 KB Created: 2020-07-27 05:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da1ea891a84b986069ca7cb9eca7e00 SHA-1: c9d68a29f9dce01f53a808bf9279b620dc053f57 SHA-256: 3bb4578e1a46a68fba1339942f211d0d4d80c61c89c25eab94d35e0e91368be1
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'flannel sheets queen clearance' and application metadata, suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious site.

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=flannel+sheets+queen+clearance
    • http://files.nuskin-success.com/uploads/1/3/1/0/131070611/zezopufabonoriw_lixesonibidig_kagirasenufak_verifavinuju.pdf
    • http://files.sunpawco.com/uploads/1/3/0/7/130740357/5894626.pdf
    • http://files.tatacoltd.com/uploads/1/3/1/6/131606408/kumuwuruzanafixaluk.pdf
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdf
    • http://files.waubonsiestudent.org/uploads/1/3/0/7/130776416/woxuvegowosamugawon.pdf
    • http://files.sunpawco.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/60846645324.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/lewobaderuveluvul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/33293429458.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/rariloxewolomorukebala.pdf
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/58250545567.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/84057687573.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/tafaniwekuxosenaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/repaxabixukowasofejadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7257/6922/files/56837944872.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_off000056c8.bin
a1b25b2ef66dc6bcdb63e80bc3b89134209e95395d48c8e94118754a808383a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C8 4692 bytes
font_01_sfnt_off000066a9.bin
29e358336de3c0720b0d096ab2c9a06325d2899a442d9aa65d8e4c8e75e883b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A9 9532 bytes

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