Malicious PDF — malware analysis report

Static analysis result for SHA-256 29991941778e4f10…

MALICIOUS

PDF

44.7 KB Created: 2020-07-19 21:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1efd0066c2bd780c3ac1b74190ba6d96 SHA-1: 5256fe9c09c72c401f686db7107adb2bd1771673 SHA-256: 29991941778e4f10ca16be2583f8f38a7bd35a828063a5c9a1e92e49d5847592
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The document body suggests a lure related to 'L'imparfait cours et exercices pdf', likely to entice users to click the malicious links. 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.cc/wb?keyword=l
    • http://files.verticallyconnected.com/uploads/1/3/0/7/130776351/ximis-junimif.pdf
    • http://files.nature-myview.com/uploads/1/3/1/4/131407796/wajefufuvurekotazajo.pdf
    • http://files.sweetiescateringnc.com/uploads/1/3/2/7/132712080/6172744.pdf
    • http://files.marshallstileco.com/uploads/1/3/2/7/132740399/zamajit.pdf
    • http://files.apollongu.org/uploads/1/3/1/6/131606035/2870775.pdf
    • https://nubobobabubu.files.wordpress.com/2020/07/25717146089.pdf
    • https://sigexogowoze.files.wordpress.com/2020/07/53838984608.pdf
    • https://kidugusex.files.wordpress.com/2020/07/wemexixelebiminuluf.pdf
    • https://jonasege.files.wordpress.com/2020/07/kunitadi.pdf
    • https://rewakapupad.files.wordpress.com/2020/07/1139969427.pdf
    • https://lemobiruwira.files.wordpress.com/2020/07/pepujukazapewisoto.pdf
    • https://worovemetum.files.wordpress.com/2020/07/69651985737.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/numetonasebubamupuzom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/derat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/69613451966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bumagigefabap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/26050253397.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/wabat.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_off00006d43.bin
88030085227f7df2d5df070edef75440c8831c980438ca745a67039cf06ed9d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 5088 bytes
font_01_sfnt_off00007e95.bin
14504a63e761c99f89f995897bb5adaf595dc7c52fc8f3a6a279e0f102c82c13
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E95 11724 bytes