Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4340a667bcae515…

MALICIOUS

PDF

119.1 KB Created: 2020-08-18 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe59f9f7ac28367c2d1bd10e3675d3c SHA-1: 3e5be297c475ee7c8da909437d90af4649166a22 SHA-256: d4340a667bcae515a8bbeb3a3779b6bb1036df2fa6bf56ca8cd5899850740b17
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. This suggests the PDF's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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=activity+4+detecting+and+creating+magnetism+answers
    • http://lebagif.honoluluintertribalpowwow.com/uploads/1/3/1/4/131454065/9eed0df.pdf
    • http://files.gilfordphysicaltherapy.com/uploads/1/3/0/9/130970009/9809804.pdf
    • http://files.checkmycloset.net/uploads/1/3/1/4/131407138/nurepunitiwax-bewijazunad-vavugafo-kuzakimevesega.pdf
    • http://files.gladwinharrisoncatholic.com/uploads/1/3/1/1/131163969/vupubifosimegufepir.pdf
    • http://files.checkmycloset.net/uploads/1/3/1/4/131407138/nurepunitiwax-bewijazunad-vavugafo-kuza
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/vaxaxomun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/14419078056.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/52633139001.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/amma_feeling_songs_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/66474392839.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/22949761767.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/milebenevetokabedesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/15904787697.pdf
    • https://cdn.shopify.com/s/files/1/0431/5421/0980/files/94490450602.pdf
    • https://cdn.shopify.com/s/files/1/0437/0228/8537/files/50248503978.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/tojakuwog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1559/files/94288466399.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c71.bin
8496b3e4a3e3c057d2e10390d6a0963492ab63c1d54ddcaa729a44b8a56e51d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C71 5556 bytes
font_01_sfnt_off00019f5a.bin
c9de7bc9ecf9011e73b5199ec0ceac700853bf45019cb2dd1ed121e25831c781
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F5A 14804 bytes