Malicious PDF — malware analysis report

Static analysis result for SHA-256 144527a0fc95daa2…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 17:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c1db231ec77eda3244bc9b71c033fb SHA-1: 18573c1ad410b754c234f8c26b40b83d485d1c08 SHA-256: 144527a0fc95daa2ae8192c8dc631d515765e96fcfe62d73907b92989130e05b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.cc/pify?keyword=anatomy+of+dicot+leaf+pdf'. It also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious one. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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.cc/pify?keyword=anatomy+of+dicot+leaf+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_ddc0630f1c2343548252af4e0678ed85.pdf
    • https://static.usrfiles.com/ugd/b5aed9_0524afecf2a442e4a68a8636322e131f.pdf
    • https://static.usrfiles.com/ugd/917232_6389099a6fd040c1a06e2b497767c551.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f9da9d239c04b9490fcdb421235720b.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/video_er_app_for_iphone_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/famokup.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/template_arlina_design_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/5798/5189/files/races_in_dnd.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/71247763060.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/zazurokakekesonekeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/xitukilim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/proform_520_zni.pdf
    • https://cdn.shopify.com/s/files/1/0447/8353/4229/files/31132110829.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/ipl_2017_match_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/autotune_for_pro_tools_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/60643556242.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_off000066bb.bin
3c64b6c07ccdf1a5ffdffe3ccad404418385a296230d6c789cef4ab03ee7f800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 4908 bytes
font_01_sfnt_off0000775b.bin
0347e6a2d99ba9f2f09bf813540d104475885f9d385d7a6f96da85c2dee929d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 9456 bytes
font_02_sfnt_off000097b1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B1 4324 bytes

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