Malicious PDF — malware analysis report

Static analysis result for SHA-256 f550a1e74b344927…

MALICIOUS

PDF

38.8 KB Created: 2020-08-23 13:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7a92e1b59c0c6297d42ae248882ec8ed SHA-1: 7e4965866eb8009dbc0c8c629a39c7c5863ce6aa SHA-256: f550a1e74b3449274eea3d3fc8acd20b4ccafd45a97908a246de5b9cddb54a17
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Invertebrate classification challenge answers' and the malicious URL, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous links, likely part of a link farm to improve search engine ranking for malicious content.

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.com/pify?keyword=invertebrate+classification+challenge+answers In PDF document text
    • http://fajizu.davisairrepair-nwa.com/uploads/1/3/1/3/131398017/32892b625affb1.pdfIn PDF document text
    • http://files.janterradobe.com/uploads/1/3/1/3/131382092/4684053.pdfIn PDF document text
    • http://files.hecklerancestry.com/uploads/1/3/0/8/130813701/8332699.pdfIn PDF document text
    • http://zebivefi.meganlewis1illustrator.com/uploads/1/3/0/7/130775388/wuxexovinasar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/vekudubesagirirozep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/10214030194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/65010271916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/rangkuman_materi_biologi_sma_kelas_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2595/4973/files/3510117631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/41157940840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/54299604977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/zawumugalovifakejigesus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3704/6437/files/zakewazuxubenur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/chaconne_bach_violin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/nejinapexubineloze.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_off00004cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAB 5160 bytes
SHA-256: 1f48f2f16b7031682288b216596f567d8095389f274a73fb3d470081510c5aa6
font_01_sfnt_off00005e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E32 9920 bytes
SHA-256: 9b7cb6a60d7a624c0b2b0e51bfef528f4db09fe20a53974e08f765cf323548bf
font_02_sfnt_off00008025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8025 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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