Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a1dabc97b0f6ee…

MALICIOUS

PDF

51.3 KB Created: 2020-08-15 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e771df146daddf3d868ce34afef2dd8d SHA-1: 2c55f49cb296d7c24122e2e6884ba3a5b252a0b8 SHA-256: 82a1dabc97b0f6eed14160bc2658593348e6f818f431218c902f83550fa33235
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to lead users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

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=big+boss+audio+songs++com
    • http://domawa.shouqalhudaif.com/uploads/1/3/1/3/131378776/zitorumazi_mujag.pdf
    • http://nuponu.adidulza.com/uploads/1/3/1/4/131407588/xesajogukudivipixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/italian_food_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/15451211335.pdf
    • https://cdn.shopify.com/s/files/1/0440/4035/6005/files/junavadopovawasobegifa.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/acta_constitutiva_de_una_empresa_formato.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/kakiratimowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/mechanism_of_general_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/kopex.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/libinakekatow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0967/files/weather_mobile_al_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0438/3804/6365/files/behavioural_game_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/33876218541.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c9c.bin
fdd559c79afcc7624114901015bdd7f76b26923435914ad8a42eda8e5a38e333
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9C 5320 bytes
font_01_sfnt_off00007e93.bin
948cb9efb97dc52c40a7129418de14a20a62df2bd717571cad19a40a2bc5c28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E93 14112 bytes
font_02_sfnt_off0000ab02.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB02 16204 bytes