Malicious PDF — malware analysis report

Static analysis result for SHA-256 144b47314d3c0aee…

MALICIOUS

PDF

47.4 KB Created: 2020-08-27 15:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc8cc198c1b37340b1115287065a3cb SHA-1: 985c34384d8d1333e81c441df1b74df5362c24b6 SHA-256: 144b47314d3c0aee975ff95aeba213275183cecb31985972aa44d5dc4e526512
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 external PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. The ML classifier also 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.com/pify?keyword=bicentennial+man+review
    • http://files.skidmoresocialnorms.com/uploads/1/3/1/1/131164130/jexuvaw-lofetatimo-zirubekakuj-kamaburadolux.pdf
    • http://getexa.tylermoorefilms.com/uploads/1/3/1/1/131164250/gibekimamopo.pdf
    • http://files.catherine-cooks.com/uploads/1/3/1/0/131070581/9b77aa1db0ba8f8.pdf
    • http://files.1beautifulyou.com/uploads/1/3/1/6/131606368/5950077.pdf
    • http://files.trinitykeezletown.org/uploads/1/3/0/7/130739015/wupifarij-wanupejew-xijozomanudol-lorivusum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2003/3943/files/ethiopian_grade_11_biology_textbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/lidazimilu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/army_equal_opportunity_training_jko_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/68784657272.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/jakozovulagufi.pdf
    • https://cdn.shopify.com/s/files/1/0449/9596/9182/files/texas_warranty_deed_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/7420302851.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/58532308851.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/21956057246.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/panasonic_kxt_824.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/ralisation_d_un_amplificateur_audio.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/42976331114.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bff.bin
b77a27c50ffbe1cfc762ff1056fb47cdd030bd848a1c918d811caca530f3a251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFF 4968 bytes
font_01_sfnt_off00008cd6.bin
4608265a2532e3316bb7701af5ce054595db8cd88cb42fb618738290675dcfb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD6 10536 bytes

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