Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb81dc8e24f6bcb8…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 90357e01a33bd0169b4926a6f98ed0b5 SHA-1: e03772eb0f93c8ab46727df631ee97aeb45f65c1 SHA-256: cb81dc8e24f6bcb895790e3842972a7e7f54322d0c2063437dbc934caf596a0a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=astrill+vpn++for+windows+10'. This indicates a social engineering attempt to trick users into downloading VPN software. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The presence of numerous other links hosted on cdn.shopify.com suggests a link farm used to obscure the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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/pify?keyword=astrill+vpn++for+windows+10 In PDF document text
    • http://files.bethelroyalheirs.com/uploads/1/3/0/7/130775516/2537912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/xodovelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/xixunexujatinasebejewexag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/lorowatikutiruboji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/walezilufotalenuzodumis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/baritone_horn_music_sheets_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7841/6539/files/pro_forma_income_statement_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/65772182999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/30117023331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1551/0952/files/30332500155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/99178310694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/looper_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/52148056852.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BB 5160 bytes
SHA-256: ddb7561a7aaad50c9c738d29c985423acae3c1934b21d50b09286d60d3a9bbcf
font_01_sfnt_off00007475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 10296 bytes
SHA-256: 4d038a16d104dfd2d187459e51d9c116afdea75c2a19881ab2c02e6448c0a515

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