Malicious PDF — malware analysis report

Static analysis result for SHA-256 b455f1e0721f14b4…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 01:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2b342b2ee0c935c69a0e2ec2823446 SHA-1: 33d5106ecb8fe6a158ffcf36b2d77e4a3eff9cd5 SHA-256: b455f1e0721f14b4becf35cba76dc185b899cd66861ee7af96331144358722a3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF documents hosted on Shopify. One of these links, however, redirects to a known malicious URL (ttraff.cc), indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and appears to contain the malicious URL and other benign-looking PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=word+association+test+ssb+pdf
    • http://jabuxada.carlemile.com/uploads/1/3/1/4/131438142/lawawexupitomuwol.pdf
    • http://files.perbrunskog.info/uploads/1/3/2/8/132814136/8678401.pdf
    • http://files.stteachinguk.com/uploads/1/3/0/9/130969751/0df970f6a21969b.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/xiaomi_airdots_pro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/gexamosoduwamogalizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/51460014139.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/nerogow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/39726938545.pdf
    • https://cdn.shopify.com/s/files/1/0430/8310/4409/files/joxirawewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/bapazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6010/9210/files/19487013452.pdf
    • https://cdn.shopify.com/s/files/1/0431/6466/3967/files/failure_analysis_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/86718900119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.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_off00006836.bin
df18ca8e8e4c32b54b630c950925a048f2b6c37dc886de390f89cf1c77e4cabc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 5272 bytes
font_01_sfnt_off00007a3d.bin
249a0715c8e89ade652d2af19f9cd0a773f55b4920e33f8bce99a215c220b1d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3D 10296 bytes