Malicious PDF — malware analysis report

Static analysis result for SHA-256 490fb30dfd0f0db0…

MALICIOUS

PDF

48.2 KB Created: 2020-08-20 02:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a0dc8deb91bdc65ec0a0008453f8f5 SHA-1: 108e7fd32bb4e0a39299183969ab2da913015a41 SHA-256: 490fb30dfd0f0db0717a9fba9320985d30b2932087d4b1a496bc45c07be16149
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, embedding numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title 'Alphabet lettering template', suggesting a lure. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

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.
  • 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.ru/pify?keyword=alphabet+lettering+template
    • http://files.hocataaps.org/uploads/1/3/1/4/131453188/7698390.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/caterpillar_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/mebiwilogopulimopuvez.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/rotofizexorobeviwusuvesim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/grade_2_english_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/veboxetuxaledupokofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/12128637996.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_off00005e6a.bin
561647c9db18905de6e9eb158e724e61bc704e577afb2b1a6250ff69e013afee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6A 5184 bytes
font_01_sfnt_off00006fda.bin
87e78fff0b5de8cb3c28454ddffa2b420e10a70711f4417f5c2fde8c1d12bc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDA 13268 bytes
font_02_sfnt_off00009a21.bin
a123eb9bf0d37b3a960b4b9fe9d9c344b11c52405241c5fee8ab5cad87b91792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A21 17460 bytes

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