Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ed3a99df07fdac…

MALICIOUS

PDF

40.8 KB Created: 2020-07-29 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceed5d693845de5919b8d9e84b7753d0 SHA-1: 2acff3dbfca2de2299abd43a60a93d923d7e5c06 SHA-256: c5ed3a99df07fdac588e386cf4a56f251805ff99e76c489015f4e020791d9037
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to direct users to malicious websites for phishing or malware distribution.

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=ombra+mai+fu+pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.librariansonbikes.com/uploads/1/3/0/8/130874019/gudejop.pdf
    • http://files.countrysquireinn.com/uploads/1/3/1/0/131070178/xaxoliwixurawiz-sadowuzi-wofavuzuvositib-pufuvej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/sesisusifekupomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/94133456825.pdf
    • https://cdn.shopify.com/s/files/1/0434/7569/7830/files/dalulegifefeloroti.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/80878995654.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/30106106277.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/dapuvejijapub.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/25125291046.pdf
    • https://cdn.shopify.com/s/files/1/0440/7705/6165/files/kojuxajezunakesunix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/20688129732.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/fatuf.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_off0000618b.bin
459ad17ef5e48c316baf74ff00ea5ac459b9bcfe46a2a8f1c1783d3c4cf0b66c
pdf-font-stream PDF embedded font (sfnt) at offset 0x618B 4612 bytes
font_01_sfnt_off0000711d.bin
600486071c518fbbd1dcaf1622369fde9f31e961d3e762f8c3dc10bcced6146b
pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 11816 bytes