Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa8886313dda1fb…

MALICIOUS

PDF

56.5 KB Created: 2020-09-17 01:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10601526319cda03be54cfe7afa6bf6e SHA-1: 9c90bda1e512bb52e939648725e2d2ab29618a49 SHA-256: eaa8886313dda1fba9307b5c9b9712b4f2da1e270ba5151905760d8beef04d0e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text but includes a URL that matches one of the embedded links, suggesting an attempt to disguise the malicious intent. No scripts were extracted from this sample.

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.link/wix?keyword=la+salle+city+council
    • http://sufulaga.uusandiego.org/uploads/1/3/2/6/132681670/joxupag.pdf
    • http://files.stevensprickschuster.net/uploads/1/3/1/4/131437778/bikux-foxij-bisofa.pdf
    • http://files.glamorousreputation.com/uploads/1/3/1/4/131407005/guzozujulibof.pdf
    • http://files.thedragonmasterawakening.com/uploads/1/3/0/7/130740592/kosogenopewiz_fovemak.pdf
    • http://bivole.antiquequilthistory.com/uploads/1/3/1/0/131070786/60326326467.pdf
    • http://files.nighvision.net/uploads/1/3/1/4/131453990/4085270.pdf
    • http://zulesixuf.nsjp.biz/uploads/1/3/1/3/131380213/1aaceceb6ad78a.pdf
    • https://a36d34c1-75c4-4705-b517-848fb61664a7.filesusr.com/ugd/5ea691_abbc1266e73c4db6aa4542998bcd1f99.pdf?index=true
    • https://8a63741f-7fca-4cb4-95d4-7f3e5eff1484.filesusr.com/ugd/724fb5_2b6c343bdd67496c87802122759abfdd.pdf?index=true
    • https://79817f94-a8ad-4518-aec1-4fc3727fdc50.filesusr.com/ugd/b0c717_ed3cb07a7ab145799d2a50578471dd88.pdf?index=true
    • https://d7c520e9-031c-4622-a0c0-6948a0780413.filesusr.com/ugd/5b1e3c_7d4db3730246453d892a52d02a798951.pdf?index=true
    • https://e3897e67-ef1d-4554-98c7-b124a7854300.filesusr.com/ugd/2eedf1_2883ecec76b348e1a8f44580daa844a4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/7487/0689/files/the_treatment_of_armenians_in_the_ottoman_empire.pdf
    • https://cdn.shopify.com/s/files/1/0437/9312/1442/files/watch_coraline_full_movie_free_stream.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/93939662506.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/58058655237.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/81916692171.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_off0000a082.bin
197664624e879b3a764b06ab9d9d134c24947520f7e73a3fc81d2dfc51a7d3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA082 4740 bytes
font_01_sfnt_off0000b0c3.bin
e9fd4d90fcb605b4b4187b9b5b7e2ba5a5ed844922681e3f7c1bbe53a345cde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 10832 bytes

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