Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce2aaebc42ed9d2…

MALICIOUS

PDF

47.7 KB Created: 2020-08-06 23:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe2ab93abc025f0cb43ce96af9bfca54 SHA-1: 7bb2a09b853c82703cea4a04501c275ed73548ce SHA-256: 5ce2aaebc42ed9d2b0ccd2a7c4f93c07438601b503ad0dae5bbd773d20625c43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The heuristic firings indicate this is a link farm designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. 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.ru/pify?keyword=plus+two+business+studies+notes+in+malayalam+pdf
    • http://files.englishlearningexpert.com/uploads/1/3/0/7/130739214/jizogidijebo-pigeg.pdf
    • http://files.accesseuropetour.com/uploads/1/3/2/7/132740181/vuzopi.pdf
    • http://files.win19.org/uploads/1/3/1/4/131453143/5455180.pdf
    • http://files.5elementscoaching.org/uploads/1/3/1/6/131606758/xixelogurejakin_pejunupor.pdf
    • http://bimiviku.wchistorymuseum.com/uploads/1/3/2/6/132681556/8883765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/jafavamakoravugeginutis.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/lerorepuluvoxejote.pdf
    • https://cdn.shopify.com/s/files/1/0435/6207/4261/files/52274205734.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/meturi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/78330269924.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/tegosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/lenguaje_musical_ritmico_ediciones_si_bemol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/kizasunamujepipaxif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16494210232.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/what_s_the_best_status_for_github.pdf
    • https://cdn.shopify.com/s/files/1/0435/9372/8159/files/tudigovezitexeti.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d01.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D01 6440 bytes
font_01_sfnt_off00007cf5.bin
2b4e25dbe84de44f4b4a7a740f372433d5ebe91e3c0dc764f832b9e6741260ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF5 5428 bytes
font_02_sfnt_off00008f6a.bin
3cf0145ed4eccc3181929895f07f89342a80713ba4b6467273db66f4a0a43240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 9960 bytes

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