Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c937a39f1f6b72…

MALICIOUS

PDF

54.2 KB Created: 2020-07-29 10:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce8adce800384ba34c6750c86fec865 SHA-1: 89e29fe3b2344b1232c153be39ad36b4b678df12 SHA-256: 45c937a39f1f6b72170d5152bc897e6b10a3bbacc2f7d6dc9db5d2f5ff30db02
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'pmbok 7th edition free download pdf'. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy to distribute malicious content. 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.ru/wb?keyword=pmbok%207th%20edition%20free%20download%20pdf
    • http://files.oakmountainfirewood.com/uploads/1/3/0/7/130738803/7664954.pdf
    • http://files.treeservicejacksonmi.com/uploads/1/3/1/4/131453453/kuguxarajuselit.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/0/7/130775373/dorajimunawanotosal.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/84898252679.pdf
    • https://cdn.shopify.com/s/files/1/0428/8253/1481/files/97874418831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/tasop.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/migibiwojevireletenigiwot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/fowisewofewixixit.pdf
    • https://cdn.shopify.com/s/files/1/0437/0395/9720/files/xugojorivotafabonivogimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6790/files/nifozoxedukisewefavute.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezax.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/rapawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/940828958.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/jesasibolezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/xoxusofiremiz.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_off00008bce.bin
2bcc3779bf464d5b4acf5e86a36387fed9cf83f35e4bc53eed729e5765540b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCE 5268 bytes
font_01_sfnt_off00009d96.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D96 1800 bytes
font_02_sfnt_off0000a623.bin
3129a92e3f088a610c7b4cc405ef044b6fec920db42d8c0c4682cdebc45256e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA623 10936 bytes

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