Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aabdd6ece4bbd9…

MALICIOUS

PDF

50.3 KB Created: 2020-07-31 07:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 88a4dd3d7b6b2e0bd57d73842eb5e912 SHA-1: b9b70f75cd0e7fc63ac7773fcc4ec183c1cfd626 SHA-256: c5aabdd6ece4bbd97f2f26a96a10eac85171954843a87c5dd9266ede3efbce8d
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'data structure and algorithm multiple choice questions', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=data+structure+and+algorithm+multiple+choice+questions+with+answers+pdf In PDF document text
    • http://files.aoo1933.com/uploads/1/3/1/1/131164095/bizajali_wiruwumuvi_karugubarelori_bebarufedideta.pdfIn PDF document text
    • http://files.harmonyriproducts.com/uploads/1/3/0/9/130969433/vutokukibefujowe.pdfIn PDF document text
    • http://files.johntoohey.net/uploads/1/3/1/0/131070581/rivomixipakaviz-runokoraputuji.pdfIn PDF document text
    • http://files.ballmania.com/uploads/1/3/1/4/131437655/kakoxoxafin_buwopodikeku_jitinuto.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/1/0431/6302/5567/files/25893722916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/piwexodafifikuperibonibol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/43360499579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikodizexosuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4634/5640/files/75654213657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/jidametipibevugus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/tevokabafukebirudakajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/70942986450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/roguzitepowizibutepo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/59001585922.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 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 5668 bytes
SHA-256: 2fa71dc1bae2d2a1eb1040ae85c7822156434b1855620f5bfabec1c9f0c39beb
font_01_sfnt_off00008fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE7 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00009875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9875 10128 bytes
SHA-256: fe19a806c2972146296418dd204e3f7630b599775e954ada5a26e1f5d08238f5

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