Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f64cff2f834bbe…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 16:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82f092eb2ef407d7805d8387bca968cc SHA-1: 3495e563d766be737a91d1e3fa0f1eb8f84dc885 SHA-256: 14f64cff2f834bbe7414effbc39edad6ce7eacf15d9a0f72ac1e65820b26e565
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of numerous external links points towards a phishing or content distribution scheme.

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=personality+types+riso+pdf
    • http://files.hidayatashila.com/uploads/1/3/1/3/131379085/4780627.pdf
    • http://bezaso.newtampapainters.com/uploads/1/3/0/8/130874478/d1f36fa8c2ec.pdf
    • http://savavav.votejasonmcguire.com/uploads/1/3/1/3/131380480/povuvevetax.pdf
    • http://files.drgnflybotanicals.com/uploads/1/3/1/4/131411024/7838156.pdf
    • http://files.cisdfoundation.org/uploads/1/3/1/6/131637477/defigana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/localhost_using_lrpc.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/lafumikuzigoru.pdf
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/88730798426.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/autocad_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/how_to_fix_mic_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/8369/4247/files/appointment_cards_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/biblia_de_estudio_apologetica_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/79646523810.pdf
    • https://cdn.shopify.com/s/files/1/0437/9190/9025/files/91937352180.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/1680858170.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/takurowukesefojagadipoxoz.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_off0000630b.bin
e3142d8b3b1325e0cba6575d5c9a643fa76a3d12426cbd08d51a5d19c7ed7300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5140 bytes
font_01_sfnt_off0000749e.bin
b88ae5330a97c1aee279b941228ccf2c1394bab3cc4009086fa3e07fe8575552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 10564 bytes

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