Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ed23c966b757bc…

MALICIOUS

PDF

52.2 KB Created: 2020-08-04 11:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c981e1ff2ef4f4845001d3f7c2a8ab35 SHA-1: 6739456606ce5b204678f8c98d3494374cca92d1 SHA-256: a4ed23c966b757bc9ba50f069b4672c3408716b3bc5da7fffec49ea1a26d6dfd
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector. This suggests a phishing or scam attempt, likely to lead the user to malicious content. The heuristic firings confirm the presence of a malicious redirector link and a link farm, indicating a coordinated effort to distribute malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=armorseal+1000+hs+pdf
    • http://files.rmelectricsolutions.com/uploads/1/3/0/8/130814717/guzisumikapavi.pdf
    • http://files.callumstacy.com/uploads/1/3/1/0/131071114/veripij.pdf
    • http://files.sweetcheeksbyjulie.com/uploads/1/3/1/4/131437689/7722040.pdf
    • http://files.collectingvintagecompacts.com/uploads/1/3/2/8/132815787/2511046.pdf
    • https://cdn.shopify.com/s/files/1/0439/3887/3512/files/30252032013.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/9048207139.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9729/files/brother_mfc7420_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demesudixagivok.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/wuxinejivagitifibakukog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9258/files/mkdir_data_db_permission_denied.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/56427550872.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/26720377360.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/vaxebuwopurunoferof.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/20297216964.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_off00008250.bin
5b8deafe87d193375a2d5d9763ec72780c93932a94b81e2d20009552e3f04e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8250 5464 bytes
font_01_sfnt_off000094b9.bin
eac55eeb5f3bf0d7e99374e4948149c2ff583f0919c3f33011188976395511d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B9 15036 bytes

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