Malicious PDF — malware analysis report

Static analysis result for SHA-256 5587b6a1f40a5365…

MALICIOUS

PDF

121.6 KB Created: 2020-07-31 13:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83126a118bee1840c0be8e508766ab8 SHA-1: a90f91c8ab63fdbd7b44d748d1bee8e9c9968689 SHA-256: 5587b6a1f40a53657bddb48eb04743c5a8da3d1b3837841e5784e3e5086845b4
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain text related to 'definition of anthropology pdf', likely serving as a lure. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm designed to attract traffic.

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=definition+of+anthropology+pdf
    • http://files.bittersweetconfections.com/uploads/1/3/0/7/130739146/wuxosapokikovu_zovun_dawuvi.pdf
    • http://files.audio-activity.com/uploads/1/3/0/7/130739309/vaxatapamak_wuzofozativis_tesowoguw_bedijumaleki.pdf
    • http://files.phsafjrotc.org/uploads/1/3/1/4/131453260/pajosisok-xebejekosomor.pdf
    • http://files.rltennis.ca/uploads/1/3/0/9/130969497/3556303.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/nadovowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/lawadoliwifatumen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/41624221460.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/6607796105.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/piganoxegusumarijaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3950/files/gudagaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/28283227225.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/fonowagokukox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/ziguvopegew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/49245243906.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/sevut.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_off00019b18.bin
0dbf14d46681d361b11758c69b63ea68aa8d46a3ab4abe653fd6a916a4061b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B18 5012 bytes
font_01_sfnt_off0001ac22.bin
0578f8f4fff7228ba65ee4dfe45d162b88708577e86586342fede51534c627fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC22 14036 bytes