Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b46b3eb3e092fd6…

MALICIOUS

PDF

66.1 KB Created: 2020-08-20 07:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f449ff02d7abdbcbddc8be0482017408 SHA-1: 76bee8ead6cd1aa9cbc1b25707bdb1904fb6f6f3 SHA-256: 1b46b3eb3e092fd634cb8be424b76be646f23b2f6f8068ae9a75f97dccad229a
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is presented to the user. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into visiting a malicious URL.

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.ru/pify?keyword=pediatric+cholesterol+guidelines+2018
    • http://files.alvesresalelumber.com/uploads/1/3/0/8/130813804/3978e5d26fb54e7.pdf
    • http://xitul.givingclosetproject.org/uploads/1/3/2/7/132740718/3236284.pdf
    • http://files.mallygriffin.com/uploads/1/3/2/6/132681617/b8dbbdf.pdf
    • http://files.loriblaylock.com/uploads/1/3/2/6/132681617/vuxajapo-lopalekititinek-xurimidujeri-mopexal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/tonuvopumorelire.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/19058644311.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/peratexedabapirox.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/wirugowugomigagamakisirat.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/antithyroid_drugs_pharmacology.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/23968631334.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9127/files/contaminacin_ambiental_definicin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/20461482694.pdf
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/postal_rates_2020_ireland.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/vewulalututo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5637/files/foximesabitikev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/61121530819.pdf
    • https://cdn.shopify.com/s/files/1/0436/1430/6466/files/46361030928.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a9.bin
a2794d2a56e82b4f305ad6d5bdfaba28a182ee85adfc86a990e4c8071e35bb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 5604 bytes
font_01_sfnt_off0000c89d.bin
1fa67670fcb19bdf3ed28ef040ec9d19e0a6eeb565e974b2c4233b834b797f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 11160 bytes
font_02_sfnt_off0000ecee.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 4324 bytes

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