Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5475edb491f1dc9…

MALICIOUS

PDF

41.6 KB Created: 2020-08-24 17:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3da8d4d1b81d13f0df90b18a4f10be SHA-1: f467dd7433a5c307a87e98ae95d2e2e4c0cc071b SHA-256: d5475edb491f1dc9dd94ceed2667b1865c47fd9bfac90e48f29e5b8f71b8c0ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc) which is likely the primary payload delivery mechanism. The document body, though malformed, contains the target URL, reinforcing the lure of downloading a syllabus. The ML classifier strongly supports the malicious nature of this PDF.

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=bsc+2nd+year+chemistry+syllabus+2019+pdf
    • http://files.ladypatriotssoccer.com/uploads/1/3/1/8/131858592/wofuku-dapimililedite.pdf
    • http://files.claregriffin.org/uploads/1/3/0/7/130776519/juwoseropeziw_xotusizo_lixarixiwav_wuwovikofi.pdf
    • http://files.doggiestyles.net/uploads/1/3/1/6/131607575/fd41585.pdf
    • http://kexekula.fredericpissarrousa.com/uploads/1/3/1/8/131856161/7078693.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/liberalismo_y_neoliberalismo_economico.pdf
    • https://cdn.shopify.com/s/files/1/0461/0903/2612/files/63708231371.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/animated_gif_banner_maker_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/simple_present_tense_positive_negative_interrogative_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0439/3834/9211/files/naruto_the_last_movie_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/jalotabinofasuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/cadsofttools_to_dwg_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/26847745210.pdf
    • https://cdn.shopify.com/s/files/1/0433/5812/6245/files/9754535157.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/97927369804.pdf
    • https://cdn.shopify.com/s/files/1/0449/5376/3999/files/django_templateview_vs_view.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006005.bin
18abb8ee5a44d30913354b173010b4d3aa514ee9453e4d0b6b3d48b105fbfea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6005 6168 bytes
font_01_sfnt_off000074c8.bin
94286647db0efd0584e1d37195598ae083211d327f1e858cf30801cd71a5375a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C8 11268 bytes

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