Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ead2b1021ab57e…

MALICIOUS

PDF

52.2 KB Created: 2020-07-19 16:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfdc14a6a9907a84be76d19260368e30 SHA-1: 8b868c541541e8509aeceb1d575bb979d1dbe002 SHA-256: a6ead2b1021ab57e4324743d9afecea828db8abd5544109d934c49db686a0c0f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious or SEO-manipulated content. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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=bluetooth+server+socket+android+example
    • http://files.penwoodbrands.com/uploads/1/3/1/6/131637056/fosipobuda_tizojibibepabil_xuzomeb.pdf
    • http://files.stevendavidtorres.com/uploads/1/3/1/4/131453387/sesizizete_piniripi_nojupodogi_sasuzamazora.pdf
    • http://files.jerseyguidedtours.net/uploads/1/3/0/7/130738741/2ad028485.pdf
    • http://files.atlantasteinwaysociety.com/uploads/1/3/1/6/131606550/wugavawopilen-besezasifijavax-movedaxepefag-zajuvebozoka.pdf
    • http://files.madebyloulou.net/uploads/1/3/1/8/131871891/59bfb6ba928ffb6.pdf
    • http://files.nypa.com.au/uploads/1/3/1/0/131071137/nasavavirit.pdf
    • http://files.childsafechildproofing.com/uploads/1/3/1/0/131071056/7011162.pdf
    • http://files.childsafech
    • https://lovifame.files.wordpress.com/2020/06/logofutaxizizixamu.pdf
    • https://fulafemep.files.wordpress.com/2020/06/rejidekaniwodezav.pdf
    • https://bavorekivaso.files.wordpress.com/2020/06/sofabepob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/neziporoxunanakorufes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0436/5356/2526/files/fosov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/56841367936.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/71210220225.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/serezidebibetujirujenex.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/barobidimawemebit.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_off00008221.bin
56985daf6ed66deb2759eeae735ea30fec85fda0a7104154ee13430ad103f3ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x8221 5436 bytes
font_01_sfnt_off00009477.bin
9c810fe3f7e337f9feb5326db3067a732b1e931367a9681a95d758323fc66849
pdf-font-stream PDF embedded font (sfnt) at offset 0x9477 15100 bytes