Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0d10a3eb4747b3…

MALICIOUS

PDF

44.6 KB Created: 2020-08-21 00:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3eeb606cc1b7b948c15d7c3439264d SHA-1: 52d160b5e3315cfd2fb67412c838f36477a80613 SHA-256: bc0d10a3eb4747b385a510ecc269da6578ace60b47b48a642561f95c9acd7560
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=bixby+voice+assistant+app'. This URL is presented within the document body, disguised as information about a "Bixby voice assistant app", indicating a social engineering lure. The presence of a large number of external PDF links further supports a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=bixby+voice+assistant+app
    • http://wuperepul.studiorezonans.ca/uploads/1/3/1/4/131452821/1654783.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0437/0186/2554/files/jawevireteziwaxolokivug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/jagepum.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/bacillus_anthracis_factores_de_virulencia.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/luzuxebakurawepokoweguve.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/counting_principles_worksheet_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/71791445955.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/1867277933.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/mopokagagume.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0265/files/651553631.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/20834158875.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/1/0428/4815/7859/files/counting_principles_worksheet_1

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006364.bin
05dcbd2ddfd5bc18dfd89f48b7546b53f50a54f3c3aa177613c22520e47465a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5008 bytes
font_01_sfnt_off00007475.bin
c5eb67bc701b5575f2467468b40ed97ee525b6b8a559ae8a219003531856c33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 10196 bytes
font_02_sfnt_off0000976e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976E 4324 bytes

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