Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e47506d94672ae…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 08:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce197f0462c5af195aa8d486af83ce2a SHA-1: f490a4429c959ad5b65ce7a476d2ad8bc088a861 SHA-256: 78e47506d94672ae2b354ee859b40859933213321f853ea9663c19531aa1aae2
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one disguised as an 'AP literature book list pdf' that redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector indicate an attempt to lead the user to a harmful site.

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=ap+literature+book+list+pdf
    • http://files.burbgarden.com/uploads/1/3/0/7/130776327/nipozutuluroru.pdf
    • http://files.newtongrangegala.org/uploads/1/3/0/8/130873715/6446212.pdf
    • http://tugal.prohuman.co/uploads/1/3/1/4/131438477/3619897.pdf
    • http://files.sjtcounseling.com/uploads/1/3/0/7/130739120/4416c7eb47c7812.pdf
    • http://files.kellytuckercreates.com/uploads/1/3/1/3/131380337/xazovexenoriw_ralipeter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/aorta_and_its_branches_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/pinellas_county_homestead_exemption.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/adobe_photoshop_cs2_tutorials_for_beginners_download.pdf
    • https://cdn.shopify.com/s/files/1/0446/6167/0051/files/auto_cascade_refrigeration_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/learn_applescript_the_comprehensive_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/form_dl_44_california.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/75750463995.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/7637159017.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/lizuwakerolorikesalediwem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/sukuzeroxapenusoran.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/you_ll_never_walk_alone_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/belief_in_a_just_world_scale.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_off0000715c.bin
3ec28cb67fbd87d7a923e1161595333a7f8d08127a44c9db1213bccec7d92085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 5228 bytes
font_01_sfnt_off00008327.bin
9651516f433ec66dd3273c0ab93c9a9c392ef1337f307198e278f6932bfade4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 10304 bytes

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