Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df4473ed808b00…

MALICIOUS

PDF

43.3 KB Created: 2020-08-09 19:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7fd386ce5cbddb977f7aedb1366349c4 SHA-1: 3571d2a1c96c8c99f105ed1f1748c5fb93609535 SHA-256: f4df4473ed808b00c50b437652c3cf153c982d3ee96a3ec8b4649b474e681b11
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to 'https://ttraff.cc/pify?keyword=technical+communication+english+skills+for+engineers+pdf'. This indicates a social engineering attempt to lure users to malicious content. The document body, though heavily corrupted, contains the same keyword, suggesting it's part of the lure. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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.cc/pify?keyword=technical+communication+english+skills+for+engineers+pdf In PDF document text
    • http://kazedet.aveerat.com/uploads/1/3/1/1/131164250/bagudibigazinex_bikikijilomupig_fojuvabek_pezup.pdfIn PDF document text
    • http://files.tellurianresearchpress.com.au/uploads/1/3/1/0/131071312/votexo_mutigotesaw.pdfIn PDF document text
    • http://files.featureceilings.co.uk/uploads/1/3/2/8/132814544/lotiloma.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/1/0430/9411/4465/files/8735819547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/zuwek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/xufaremumip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/mental_health_illness.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/kojilosifawesememelunup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/3751779969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/74085283354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/mixiwude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/bipiwimejisuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/voxutirujerobubonexanibot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/boragudoxodel.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 1

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_off0000693e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693E 5584 bytes
SHA-256: 180823111fe10a76d515eb80f08079101120c569195fce36d05a8ae4c48d8f0f
font_01_sfnt_off00007c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0E 10700 bytes
SHA-256: 58d71872d8aef5146459d48939103a370b7b1be521732ad2452d2c2f79bbdbec

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