Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e8cac60061454b…

MALICIOUS

PDF

83.0 KB Created: 2020-09-07 06:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e977a0c174293d82d983b3ff54457c15 SHA-1: 11ea5e752b8cf67526c1ae4c5db60219652d5d49 SHA-256: b4e8cac60061454b26023d8ab1812b9f6d8a0af529a84899b65a918e752318f8
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. A critical heuristic identified a link to a known malicious redirector at 'https://ttraff.club/wix?keyword=d%2526+d+5e+dm+guide+free'. The majority of other links point to Shopify domains, suggesting an attempt to obscure the malicious destination or leverage legitimate platforms for distribution. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.club/wix?keyword=d%2526+d+5e+dm+guide+free
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/8354505765.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/wazozaxebepiziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/tawibikovegasez.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_155355751f9444c8a1a38311131745eb.pdf
    • https://static.usrfiles.com/ugd/ef7486_fba279cc6f144624a6a8d4a13f8aaedc.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/60996200651.pdf
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/1578265646.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7230/files/tiderugowapab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4902/files/boniwatu.pdf
    • https://static.usrfiles.com/ugd/87a178_29af42b8eb374c5bbb034baefec004fe.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_03a8abd437914893a246661c9da94ce4.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_c77cbc6d91fb478abe971ecd3b588a5d.pdf
    • https://static.usrfiles.com/ugd/69695d_4700018f2b344763a11e96cfbb865e61.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/
    • https://cdn.shopify.com/s/files/1/0432/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00012c73.bin
8833e794d173bb86d35998b8f8cec386ae626a4c8d7c1e20265ed047fcc2bafe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C73 6572 bytes
font_00_sfnt_off00008bd0.bin
03de04004cdd807ea9c269500cd56b06efda50ff8db7b95da1d31ce30d174ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD0 7516 bytes
font_01_sfnt_off00009f55.bin
b72324bf9fb2f960ad531a0c7fe13c100795e1c8b461db9e4f4d6c8496002b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F55 3148 bytes
font_02_sfnt_off0000aa94.bin
7b9a78bc71d00e4bcff8473d51fc82c270a18144a13d22e5cfd906eda86eaada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA94 4156 bytes
font_03_sfnt_off0000b882.bin
f19737e7ae504a93f2c40ebdcb093e324ed3d787609e781d4a33af58a066a9a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 6280 bytes
font_04_sfnt_off0000c7ed.bin
00f29ba352bedfc137a9f28676ea95b85d59365ecade2658b96dc6be88c71e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 30052 bytes
font_05_sfnt_off00011594.bin
7cc29516b49035356d5f2622e861406dcf05a3999b9e639e3451a4ca87db92b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16572 bytes

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