Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f81e129b3c921…

MALICIOUS

PDF

44.4 KB Created: 2020-08-20 00:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bedc9be53533837ee7cd02b694ac67d SHA-1: ad437e3afc4b1ba02143dc63a54a5c6d70125bc1 SHA-256: cf9f81e129b3c921e9e22cc0cdb6483f048598cafe34512ce8eb97848dc42868
168 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell T1218.011 Signed Binary Proxy Execution: Rundll32

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to deliver a payload. The document also instructs the user to disable security software, a common tactic to bypass defenses. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content. The document body itself contains the malicious URL and other PDF links, reinforcing the lure.

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=aspen+hysys+program+free
    • http://files.danoboots.com/uploads/1/3/2/7/132712251/4dd01071cb.pdf
    • http://fodiwu.simplyoakboutique.com/uploads/1/3/1/3/131379530/bejesul.pdf
    • http://roguxi.unawestchester.org/uploads/1/3/0/8/130874197/6cc8a27f47.pdf
    • http://files.beneaththesurface337.com/uploads/1/3/1/3/131379301/f577ed02f44.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/assembly_language_raspbian_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/giforetiweraxetakag.pdf
    • https://cdn.shopify.com/s/files/1/0443/0348/3036/files/best_logos_ever.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/probability_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/48235323133.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/80525159204.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/duvofena.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/ccna_voice_instructor_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/7725698738.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4143/files/pibegolirida.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/seduzusaxiruxolonifaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/accouchement_dystocique_memoire.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/22223931225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621e.bin
9e051dbc474175a12d85ca51c5df4171c1dd84c6b1d5b63ee98bfbdb84fe7fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 5032 bytes
font_01_sfnt_off00007302.bin
a60463b366965ee949bb24004ba3b04f85065a8a20d584abcd2d1ff8a50b18e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 10468 bytes
font_02_sfnt_off00009699.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9699 4324 bytes

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