Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aa92aab3d7f92d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-16 18:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 83095d2c5daca7516668b375c8786ec8 SHA-1: 5c90e331ff25a7d41359cb930c8d3a75341418c9 SHA-256: 16aa92aab3d7f92d475c713bac2f03b41d572e91c1b77d212b7ccb492f68bc6f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary redirector identified as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF files, suggesting a lure to disguise malicious activity. The ML classifier and heuristic firings strongly indicate malicious intent, likely for phishing or malware distribution.

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=exclamation+sentences+worksheets+for+first+grade In PDF document text
    • http://nawuw.emilyhuntermft.com/uploads/1/3/1/3/131379362/mapakinunuxojat.pdfIn PDF document text
    • http://files.us-history.net/uploads/1/3/1/4/131482822/jegekokegu_mipepitalitak_pepib_netorokibuzol.pdfIn PDF document text
    • http://pusagepal.littleflowerrugby.org/uploads/1/3/0/7/130738714/xewukuwo.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/1/0438/9571/8040/files/45496698754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/basketball_ground_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/43533182240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/soladedolabaduporu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/repagurife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/sexagor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/48622844574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/idioms_and_phrases_with_bengali_meanings_and_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/lineare_gleichungen_bungsaufgaben.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA7 5404 bytes
SHA-256: 662baa5ea11c96f618e40fee96888d895e6422c6886bce41828240eee5f85d17
font_01_sfnt_off00005dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 10024 bytes
SHA-256: 83cee2d16105ddf2d56ea7341909fa5cff41fdf241cf4b2c98587717792bf1f0
font_02_sfnt_off00008030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8030 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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