Malicious PDF — malware analysis report

Static analysis result for SHA-256 174cb2d41f527066…

MALICIOUS

PDF

54.4 KB Created: 2020-08-31 19:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4781c94a47e062bdeb35a3567a5f866e SHA-1: 0d906a61f6823a87698425af33f2962375c949f3 SHA-256: 174cb2d41f5270663cc20198a3904c052f7eed9d6d565507088ed6558b94d824
162 Risk Score

Malware Insights

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

The PDF contains a link to `ttraff.ru`, identified as a malicious redirector, and exhibits characteristics of a link farm designed to host numerous external PDFs. The document body, though heavily obfuscated, contains text related to a 'Delhi police civilian answer key' and the malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=delhi+police+civilian+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/9438/4546/files/55722194984.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/xexetadulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/emotional_freedom_technique_for_dummies_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/66645647604.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4880/files/67127753010.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/98848333408.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6064/files/9546626921.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/el_poder_de_la_kabbalah.pdf
    • https://cdn.shopify.com/s/files/1/0438/4030/7362/files/39050327240.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/15191815954.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/andrew_james_barista_espresso_coffee_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/nivutisijimededajen.pdf
    • https://cdn.shopify.com/s/files/1/0438/9342/4283/files/fda_adverse_event_reporting_system_public_dashboard.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/revelation_road_the_beginning_of_the_end.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/sufavivupezirokowekim.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_off00007382.bin
b8f96481bfd220de4d58c023c4b207df0f064844318589a00cc28b4a87807141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 5336 bytes
font_01_sfnt_off000085bd.bin
8c0e409a4d0ef4bd984abb4f5ffa456a093ce8eb6baf106eb98a5c5d636ed32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 10012 bytes
font_02_sfnt_off0000a865.bin
516c55fb9e946a4561c75231be40bba6e2a5da3be462323eac87d559c611d01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA865 11972 bytes

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