Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4b30f1b25f635…

MALICIOUS

PDF

119.7 KB Created: 2020-08-24 15:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a48f3780bee86dc017939e90a67df69b SHA-1: e381685a0c9853db03a112090b9d05f8f149e4a1 SHA-256: dcb4b30f1b25f63534ff250a5716553359f17f7df9bc8f026a4f224c6141b1f6
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=oli+concealed+cistern+installation+guide'. This URL is presented within the document body, disguised as an installation guide. The presence of a link farm heuristic further suggests malicious intent, likely to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=oli+concealed+cistern+installation+guide In PDF document text
    • http://files.stmaryscountygardenclub.com/uploads/1/3/0/7/130739070/kanixumogizedusoj.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/1/0437/0723/6503/files/12602787197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/5697/3220/files/jordan_canonical_form_calculator_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/xesije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5751/8494/files/alphabet_chart_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/upsee_syllabus_for_b._tech.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/sofodubarewatozubudumuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/49503296140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4693/6482/files/zekibuvileg.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 3

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_off00018d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D48 5132 bytes
SHA-256: 6f59c37cc94a5e1aa0872ff74e5629d8015883bf14d95e24fb7d63f353ce337a
font_01_sfnt_off00019ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EBE 16704 bytes
SHA-256: 0f4dde15c54b6f69c3d850a876218dbc0916bde811b5c2c7bd67d9af3a7043ef

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