Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f82e90f3cee59a8…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 07:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303e12e2fc8861463000949d7d489aea SHA-1: 3c82f881212cdd459c1af14f99adf76b24cdc992 SHA-256: 8f82e90f3cee59a8b7204a03f95d2f52c6a0ad5d0605d6d37efa43f3ee7abe86
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'sheet music' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing the user to the malicious 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.ru/wix?keyword=annabelle+gillian+welch+sheet+music
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/87724112861.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/wopugetudegafapije.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/zatimo.pdf
    • https://static.usrfiles.com/ugd/0d002d_9a70668c45a542949f1fb1e089c861fe.pdf
    • https://static.usrfiles.com/ugd/f65175_0de632175fa44753a2e051749869153d.pdf
    • https://static.usrfiles.com/ugd/eb6612_69c42efd930e4e258f2ccc3a1942ad4d.pdf
    • https://static.usrfiles.com/ugd/3eed2b_0195162226164d61bbe65538b65cb858.pdf
    • https://static.usrfiles.com/ugd/f46427_7c127a7fa5f545e191793c25c0eb63fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a137896d67c4e77980d30d20b4a3800.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_5597cd321eee441d9ffa17d032e5342e.pdf
    • https://static.usrfiles.com/ugd/e8506d_87b2d42e5c4a4222ac5ce6b3197357b6.pdf
    • https://static.usrfiles.com/ugd/ab059d_e2f231b0fd9e46eb9a91c9ec270acd33.pdf
    • https://static.usrfiles.com/ugd/4ae4db_b6071b44f8f94e60945aec30305fc270.pdf
    • https://cdn.shopify.com/s/files/1/0437/2171/9959/files/62441781172.pdf
    • https://cdn.shopify.com/s/files/1/0449/6916/4968/files/blocky_cars_online_mod_apk_unlimited_money.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/favulogosaguvizizurala.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/xikuzuketatimoxojep.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_off0000569b.bin
6910ddfc8996ad214c3abd6bd2d43f6c290812aec0a4ab1024a7913df6801c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569B 5336 bytes
font_01_sfnt_off000068b0.bin
39c52944c3a3bccccde8d44d051fdc21b294294933dc1f7061d4b0bef2e90770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B0 9856 bytes

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