Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb5fa596728ddf4…

MALICIOUS

PDF

57.9 KB Created: 2020-08-24 19:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd9a61e7652c5eeefbff0c6d1db533e SHA-1: 1dd4f5737b413e0569d7045b2dbf80a1dae651bf SHA-256: 0bb5fa596728ddf49d7e0446a0e9d9b075823d4a765a1bb4c4458d1210d4734c
162 Risk Score

Malware Insights

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

The PDF contains a lure related to a "ctet primary answer key 2018 pdf" and embeds multiple links, one of which points to a known malicious redirector. The document also functions as a link farm, directing users to numerous other PDFs, likely to obscure malicious activity and potentially for SEO manipulation. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=ctet+primary+answer+key+2018+pdf
    • http://files.mufflerdelete.com/uploads/1/3/0/7/130739142/2f650860f3.pdf
    • http://files.vintage-dance-adventure.eu/uploads/1/3/0/9/130969728/6821117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bhagavad_gita_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/whatsapp_video_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/8757/4678/files/julalabajekumativofimav.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/yeh_lamhe_judaai_ke.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3850/files/27416218405.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/dovera.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/muwemikomevow.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/32829620174.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/wulilazimowuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9148/files/jovajumijixeledozatesumiw.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a0.bin
8a7811481af42f174b30f56237d3ffb2476f6d8b9ebfc2a2f6170ba2181c6c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 5836 bytes
font_01_sfnt_off0000877f.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 3720 bytes
font_02_sfnt_off000092e2.bin
8e5d273554ee887117ad57ceec3db8f5f2781ead0f9478695dfb5fae6f214f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 11516 bytes
font_03_sfnt_off0000b931.bin
0c3a7c24a68d2da5518d7181efa877fef0de9fe3a48feeb62dcd6099df20713a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 10172 bytes

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