Malicious PDF — malware analysis report

Static analysis result for SHA-256 4758637bee718b71…

MALICIOUS

PDF

43.9 KB Created: 2020-08-10 11:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1cf04b1839255fc9551abd112fc5a83b SHA-1: 822140484d478ad12ef2fc043ba6c68b2f142239 SHA-256: 4758637bee718b71d85e63d1c7549a411ea16d0a52fa50bf55757bfd6f641f51
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to ttraff.ru, disguised as free book downloads. The ML classifier strongly indicates maliciousness. The document body, though heavily corrupted, contains the URL that is likely used to redirect users to a malicious payload or phishing page.

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=telugu+motivational+books+pdf+free+download In PDF document text
    • http://files.incrediblydelicious.com/uploads/1/3/0/8/130813588/novusijilijiwefunife.pdfIn PDF document text
    • http://files.amybournephotography.com/uploads/1/3/0/8/130873820/kojituwudidupudisop.pdfIn PDF document text
    • http://files.pack665.org/uploads/1/3/2/6/132681951/11dbc5f6b02e70e.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/1/0435/7105/2703/files/69398191289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/36641858581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/fipadixarimazarabilim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0774/3899/files/axis_bank_credit_card_request_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/pdf_to_word_converter_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/gajebozapufepum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/13971495324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7530/3592/files/celik_wang.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/83997535264.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
🗂 Part of campaign: incrediblydelicious.com 3 samples

Related samples 5

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_off00006cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF1 5664 bytes
SHA-256: e770ba8351e4b3a4e200bf3f37712805afa15cddf7ac1db2e64018a6b90a1ec6
font_01_sfnt_off00008039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8039 10128 bytes
SHA-256: 91582bbd9b1ea2378b313b01e97874e85c3c486b625cf8ab42aadc35b4487f7d

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