Malicious PDF — malware analysis report

Static analysis result for SHA-256 a576b35fba81c21e…

MALICIOUS

PDF

38.4 KB Created: 2020-08-12 12:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8cad4c62ff18c50b4f474aa658aec7 SHA-1: 91a203664948af2a3797b2f7d683cf1ab7d9a88d SHA-256: a576b35fba81c21e1f8c2babb2c23cae0514f8a75cb6b73f0646b2dc36e6ad88
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=teks+arab+maulid+barzanji+lengkap+pdf. The presence of a link farm suggests an attempt to either distribute malware or engage in SEO poisoning.

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.cc/pify?keyword=teks+arab+maulid+barzanji+lengkap+pdf
    • http://files.edwardcooperrealty.com/uploads/1/3/2/6/132681976/gepepa-geleviwo-bopekobi.pdf
    • http://gajudavi.audreycurd.com/uploads/1/3/0/8/130814328/zivawidomo.pdf
    • http://files.sfstringacademy.com/uploads/1/3/1/3/131384432/luwogi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/crossfit_bodyweight_workouts_2._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/1166556464.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/19639584665.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/finra_series_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/96792784966.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/sakijowugepuzafegorup.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/michael_beckwith.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4499/files/bonokedaxag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/letk_kaufland_plze.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/mixuzupodasexizuwesi.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_off00004e47.bin
4130de21302d0bbb3434f0416bccc5da995df956e13b48b26c7409a97f9d3072
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E47 5640 bytes
font_01_sfnt_off00006164.bin
b0764786b8c1653902f357f8d25dec04e89d8a4327c89800661a875cebaa3036
pdf-font-stream PDF embedded font (sfnt) at offset 0x6164 14232 bytes