Malicious PDF — malware analysis report

Static analysis result for SHA-256 057a35e66e802738…

MALICIOUS

PDF

56.4 KB Created: 2020-08-05 23:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c75fb2ce63ddebd9b49c2548ee51d40 SHA-1: 8b8d44dcfba8853d31e1927737ffaf43eee63344 SHA-256: 057a35e66e802738281bec4124043bb553634ec99ea1f587091ffb38d99fa488
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'glossary of investment terms pdf', likely a lure to encourage clicks on the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for redirection.

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=glossary+of+investment+terms+pdf
    • http://jolari.isaec.org/uploads/1/3/1/8/131871740/d4cafbea9.pdf
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdf
    • http://files.iannazzofineart.com/uploads/1/3/2/7/132740462/2ccda6b7f93.pdf
    • http://files.junkremovalvegas.com/uploads/1/3/1/3/131381804/zotik_sapelomarir_juvoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/77781569449.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/jelerorexifurunowopilet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6602/files/gba_ags_101.pdf
    • https://cdn.shopify.com/s/files/1/0431/1911/6449/files/1031650798.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/82341075475.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/dejoduxeba.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/889586324.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/gusozugupusoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/tujodexerolamivox.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/fidatusoruturi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/ais_automatic_identification_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/ejercicios_voz_pasiva_en_presente_simple_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/fowixivopepazotelena.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_off00009f7e.bin
0003c2b52ab8b089d3fd4415c26275b6ebf8f30147b5f155af568ce77daa1f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7E 5380 bytes
font_01_sfnt_off0000b1cd.bin
f17b63bce6bc9262b29b5bef60777b0445f3d1293767d6035b79d039a38637d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 10268 bytes

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