Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ea7c784b4f37e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-21 18:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7314983ba02cd0d72a701199f43ba3ef SHA-1: 874707f4a6179dc2076f2b3354b1669443be0ba6 SHA-256: 823ea7c784b4f37e929cfab05b2bd8449ae6be0a6500f88bd3696f50435ecfa2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to a redirector service, which in turn leads to a malicious URL. The document body and embedded links suggest a lure for downloading a fake guideline, likely to deliver a secondary payload. The ML classifier strongly indicated maliciousness.

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=jnc+8+hypertension+guidelines+2017+pdf In PDF document text
    • http://files.creativepathwaysprep.com/uploads/1/3/2/7/132740756/1314521.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/1/0428/9835/8432/files/30617095305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/vaxogodupavovadap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/55465371122.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/19932395426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/27650825666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/milan_classification_of_salivary_gland_tumors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/power_of_attorney_form_ct.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/vibugivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/doweketifiwub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/mimivapifixifiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/spanish_1_final_exam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/31805998292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/propiedades_fisicas_y_quimicas_de_los_metales_alcalinos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/56415476031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/11922224959.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_off0000739e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 5896 bytes
SHA-256: 79c9a74665904eea1de6634e1a35bac05f7842e51b0b881206e7d32a5d0b107c
font_01_sfnt_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 15084 bytes
SHA-256: f8607db32c736bec258d271bfd881519b5ef99ff1c3edf8547e3003ffda74fb5

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