Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4728e4d9faa86a…

MALICIOUS

PDF

44.6 KB Created: 2020-08-04 05:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c7497b50c88908c2cac4a910533e04fd SHA-1: 78bcffebb7c2589e7dc3ec87ce6f5f9890673677 SHA-256: aa4728e4d9faa86a01055b7bf7d2d1eacba426e9647090a1c8f350378760ae40
194 Risk Score

Malware Insights

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

The PDF document uses a deceptive title to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness, and the PDF contains a link farm pointing to a known malicious redirector. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.com/pify?keyword=como+pasar+de+pdf+a+word+sin+programas+gratis In PDF document text
    • http://files.etudist.com/uploads/1/3/1/6/131636601/kudazibob-gatexa-rulobonawetun.pdfIn PDF document text
    • http://files.akpartnership.org/uploads/1/3/0/8/130874474/wigud.pdfIn PDF document text
    • http://files.robertlarnold.org/uploads/1/3/1/6/131636990/6355351.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/1/0435/5119/5299/files/52612534664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/61825935786.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/lokupevadurakepisejewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3899/7665/files/toponawomot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/pictures_on_chromecast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/64493971498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/lopekokola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/tazikixubururi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/productimages___ff_-_f3274e3608c2a2_full._jpg.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 8

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_off000060b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 5232 bytes
SHA-256: b06dc3c9eb436d132f1f76bfbc26c109e80c9998c8dfae66e6240d73142bd466
font_01_sfnt_off00007276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 10836 bytes
SHA-256: 0c4573b161423816abdc9cdfd7a153448026053d158893e97a0115303a8d1079
font_02_sfnt_off000095a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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