Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88f48fbdef15c46…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 22:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49f339c40196f543424c9c9c3ac4fbd SHA-1: 42ea221d86d1c1dcbe0875f959bd01d6fc2d3327 SHA-256: a88f48fbdef15c46ab07e93de3551a721d506daf8dfce490fa094eebc290f328
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which in turn likely leads to malicious content. The presence of numerous embedded links, including those hosted on cdn.shopify.com and other domains, suggests a broad distribution attempt.

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=logo+quiz+world+answers
    • http://files.spreeaad.com/uploads/1/3/2/7/132712034/xomibo.pdf
    • http://lileza.laplayaatthestrand.com/uploads/1/3/2/6/132680981/gumomuraxi.pdf
    • http://files.charlierobertsillustration.co.uk/uploads/1/3/0/8/130873715/kuziza.pdf
    • http://files.kokonutgav.com/uploads/1/3/2/6/132683014/mefukubarawugisudo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/46474248109.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/nugomafaweriditijufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/ziridemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/jujezexewoloro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/america_anglo_saxonica_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/demegojitiwedatoxufogo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/pharmacotherapy_casebook_10e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/71352533732.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/4385268972.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/binugo.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_off00005fde.bin
1d5b9d294cce693ea39fc0214aaf45bb204582c9505de3308b415dbb1225dc54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 5200 bytes
font_01_sfnt_off000071af.bin
bdacaf8194bb12637573da97aaf6bcb0f03161a727474a838039c97b545caf94
pdf-font-stream PDF embedded font (sfnt) at offset 0x71AF 10144 bytes