Malicious PDF — malware analysis report

Static analysis result for SHA-256 1692bfe274c5579c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 11:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1e912e1a80976b05944ce047ed67ab SHA-1: 0c4989dc0e47f962c18b7040a90dc36eafeaa0ae SHA-256: 1692bfe274c5579c8b72e05cf22debbc7454982c3f78a996c49b85bc47cc41fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=conditionals%20pdf%20perfect%20english%20grammar'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links but others are hosted on unknown domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious infrastructure.

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/wb?keyword=conditionals%20pdf%20perfect%20english%20grammar
    • http://dujuduta.littledenblog.com/uploads/1/3/2/3/132302780/tokokoxirutoke_gaziposajozo.pdf
    • http://zirele.antonio-oliveirafilho.com/uploads/1/3/1/6/131606552/pifawufamuvufopu.pdf
    • http://pepisuzu.mriserhoff.com/uploads/1/3/1/1/131164250/4431275.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/simon_bolivar_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/email_writing_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/sons_of_anarchy_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/26031716614.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/wacom_bamboo_software_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/string_theory_for_mathematicians.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/nivivomiwuwusazenebikilad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/7981073814.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/paxovubozit.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/catalogo_de_cuentas_sat.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/petobomapazogas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/2725575077.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005415.bin
61ef1f0772590c98ed04651cbab04b215a1d1f8a1b0e83b72e06fd390c92a08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5415 5380 bytes
font_01_sfnt_off00006633.bin
7933296c1b9ddf500504694a55d520486b34aa60cfaf3a5f015aa77cbe919b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6633 9720 bytes
font_02_sfnt_off00008758.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8758 4324 bytes

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