Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae8f1240af7fc44…

MALICIOUS

PDF

70.1 KB Created: 2020-08-10 18:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05905f8ed2306525122f9b44ad961350 SHA-1: 7700aa250b76a2f33d9de479e4d95656f44d1de9 SHA-256: 7ae8f1240af7fc44999fdb7747c2dd08ed3138c254df3a62b7bdeb081d62a590
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though partially garbled, suggests a lure related to software, specifically 'Wondershare pdfelement'. The presence of a link farm heuristic further indicates a malicious intent to distribute content or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=wondershare+pdfelement+with+ocr+plugin+5.+4.+6
    • http://zawidive.amyblackwellcomedy.com/uploads/1/3/1/4/131407995/sewipinep.pdf
    • http://files.revenuerampup.com/uploads/1/3/2/3/132303270/pubira-ninikoxareva-kuwitek-bogafezeworo.pdf
    • http://bikefatep.nfjoyfullibrary.org/uploads/1/3/2/7/132740214/5859634.pdf
    • http://files.wadehudson-authorpublisher.com/uploads/1/3/2/6/132681901/cc6fded6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/alternative_dispute_resolution_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/gepajufin.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/71762590784.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/97130804004.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/tutumulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/70135302964.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/allyn_and_bacon_guide_to_writing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/fifafopaxedudivanoxosigez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0436/9793/0393/files/fundamentals_of_physics_10th_edition_halliday.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/49091229035.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/80834993672.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/
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa4f.bin
57fd8c8ab5ac2d3a15fb38455d613831129e87214cad1fedbc201cb59e8c6caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA4F 5952 bytes
font_01_sfnt_off0000be49.bin
6d80bfd6efebad910038687f53ee4b108fcd04fd3931e9ae1d01d898bd6d9896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE49 6928 bytes
font_02_sfnt_off0000cf71.bin
5fc4aa615e3fb830294351fb0a696116f621355449c43c337932eed8b9acb0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 14564 bytes
font_03_sfnt_off0000fca8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 4324 bytes

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