Malicious PDF — malware analysis report

Static analysis result for SHA-256 83678439885f81db…

MALICIOUS

PDF

35.5 KB Created: 2020-10-29 18:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d6c0018022344b04dbdfb70bc68991 SHA-1: 95d627b1a6ab4ba2582dda034f0c09e81aa68510 SHA-256: 83678439885f81db47fc8940cd45573e011ea166552559796fb59bab9debbfbf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating it's a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/123?keyword=life+after+mod+apkpure', which is also flagged as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content.

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.me/123?keyword=life+after+mod+apkpure
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/3364199.pdf
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/9e755944df.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5f934f37484b0.pdf
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5f8e424548e3a.pdf
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/jubutufonorot_mavobup_lelijox_zojokogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0500/3912/8263/files/60860624584.pdf
    • https://cdn.shopify.com/s/files/1/0467/5954/2947/files/introduction_to_materials_management_tony_arnold.pdf
    • https://cdn.shopify.com/s/files/1/0496/3015/0809/files/26950776727.pdf
    • https://cdn.shopify.com/s/files/1/0266/8904/4651/files/petz_5_download_mac.pdf
    • https://cdn.shopify.com/s/files/1/0484/7439/0678/files/81199881892.pdf
    • https://cdn.shopify.com/s/files/1/0500/8595/3722/files/hixizine_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5560/2078/files/13610373469.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000446b.bin
e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x446B 2952 bytes
font_01_sfnt_off00004ef9.bin
2d9e92785f838c390b55cd2aa72c5124a4c3634048c884d6ad9c7d7896655d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF9 4980 bytes
font_02_sfnt_off00005fdd.bin
eb3d860673ba1c6624126f1c0738eddec423fe86b49569f08810fc606abe7cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDD 10032 bytes