Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9465dffe6a9046…

MALICIOUS

PDF

47.8 KB Created: 2020-08-30 09:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa6342717eed87678fc7ee488a3086b SHA-1: c7c4fc0386dc4116fc3902260a17e8ed6ab1f4e9 SHA-256: 7a9465dffe6a9046359db4a48c2eb2722cef68c56fd7f24a0eacce926749d1dc
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a link farm with numerous external links. One of these links, 'https://ttraff.link/wix?keyword=miss+xv+capitulo+2', points to known malicious redirector infrastructure. The document body contains obfuscated text and the authoring application 'wkhtmltopdf', suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=miss+xv+capitulo+2
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/pexumafopebejo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/wobur.pdf
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/34675638658.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/piduwekuna.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/socket._io_emit_cheatsheet.pdf
    • https://static.usrfiles.com/ugd/39cb9d_c0dea17b5525491cb6cccdf38b96c8bb.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/fodlan_winds_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/pafulavosivogogasetodu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/synonyms_and_antonyms_for_ssc_mts.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/calibration_of_pressure_gauge_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/activity_series_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a3a734cf46e429b9e3999b0607068bf.pdf
    • https://static.usrfiles.com/ugd/0dd040_5d2496f6899f48c59b5ca2ed2f8227b5.pdf
    • https://static.usrfiles.com/ugd/77d535_3f35432535b543459eba376f7ff0deac.pdf
    • https://static.usrfiles.com/ugd/b8c837_6946d38991dd4992b14f681500e3a028.pdf
    • https://static.usrfiles.com/ugd/590778_9ea24f8374d3443297764a8cf9ac5dd5.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_off00007c59.bin
720bd0cd733cc685d6ae44bf6aa16148939990d8f8c6503e7fd46a5e5c3f0dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 5096 bytes
font_01_sfnt_off00008dcd.bin
b3ece306e9e17af030dbd787da1094944696fab322f4b3f2eb3418035b5fc20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCD 11092 bytes

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