Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1cbe6ce835c3e…

MALICIOUS

PDF

61.5 KB Created: 2020-09-01 04:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0ea082f9510f309bc95dc71c3e3985 SHA-1: 5df611bf985e0ba2b074243b91d9ec3ca0104f7d SHA-256: 7af1cbe6ce835c3e72bf4ce7b3133f4c502d3dcd351f85ff0c39137b7ebe8245
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links points to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and a URL that appears to be part of the link farm, suggesting a deceptive or malicious intent.

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/wix?keyword=sad+song+we+the+kings
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/7785144837.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/internationalization_process.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/smiley_face_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2477/5330/files/ladebimebedo.pdf
    • https://static.usrfiles.com/ugd/eed56f_56c034683a654dd4b233a49b813122e0.pdf
    • https://static.usrfiles.com/ugd/784815_55ad54ee6ff24f5ea427089d1576ad88.pdf
    • https://static.usrfiles.com/ugd/33a16d_7b852d2bf2454b42bba31f1a7ff81c22.pdf
    • https://static.usrfiles.com/ugd/b8c837_528edf90f4e54b988b0956dccf9e278c.pdf
    • https://static.usrfiles.com/ugd/09c3c7_2f100bae8fc147b597f8b6db89e6991a.pdf
    • https://static.usrfiles.com/ugd/3826db_32abaf48ded64466937297ddc5201b04.pdf
    • https://static.usrfiles.com/ugd/e73fea_608a9bae2e7342559fa89febee50586f.pdf
    • https://static.usrfiles.com/ugd/f84671_bbbdf93c006c4819b2a3708dac032565.pdf
    • https://static.usrfiles.com/ugd/ade4e6_f1d9c89fc1394772a393b82d9664cb0a.pdf
    • https://cdn.shopify.com/s/files/1/0435/9628/4062/files/cabinet_ministers_of_botswana_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/26845356653.pdf
    • https://cdn.shopify.com/s/files/1/0447/7953/6533/files/adenocarcinoma_ductal_de_pancreas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/rozevivefuziginet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.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_off0000b145.bin
04121ac6de1be00af6625fcc1f31294799a64d2eadca9376ef246783e86832e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 5216 bytes
font_01_sfnt_off0000c313.bin
f5f7e9c3731aec420c5dbc1610ce63e758b11fa3760177f8a5e5f8c4f8d4fa62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC313 11532 bytes

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