Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bd81b0eac9beb2…

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 09:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b113400fa5adc23cab7377025a4b19b SHA-1: 57ba261bf1ede80f93873ffbc256a2a0fd82e149 SHA-256: 65bd81b0eac9beb2d7b04d4baa9e6f43b5ba09fe3d42f1363ffefdfb6893e987
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, likely leading to a phishing page or further malware. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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/wix?keyword=revista+h+septiembre+2016
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/73967294501.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/21034740286.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/zowimizefulumevurejore.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/curso_de_introduo_a_economia_poltica.pdf
    • https://cdn.shopify.com/s/files/1/0433/4931/1646/files/kitodiretivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/10204344983.pdf
    • https://cdn.shopify.com/s/files/1/0434/8615/0816/files/kebiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/android_led_detroit_become_human_cosplay.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/xoxeketosexofaxefuwomu.pdf
    • https://cdn.shopify.com/s/files/1/0447/6495/4775/files/create_root_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/defafojapusakolus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/76126631331.pdf
    • https://cdn.shopify.com/s/files/1/0434/1694/4807/files/67791865796.pdf
    • https://static.usrfiles.com/ugd/98e298_35d84c6e6a784fbdaff9769af9e0a2be.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8021d585d54564b8246edea1919694.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_off00004e32.bin
dbc8db5856cf8962e36e00450ea7b750192748defa0fd7037c540712668c2e83
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E32 5716 bytes
font_01_sfnt_off00006185.bin
f0d31ceedfcfed3cc467c886cf209c02c0b2ba9d8ea842ce45499e7752761e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6185 14672 bytes