Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6fa50e33053775…

MALICIOUS

PDF

48.3 KB Created: 2020-08-03 10:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc1bd0298b2b8975a504345ef6d5ff74 SHA-1: f0f8cb7d23e325b8eb1af2128a61776362da369e SHA-256: dc6fa50e33053775114dee0285f34038a58ea37642ff491e9b2a4164c37ea424
194 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to either distribute malware or manipulate search engine results. The ML classifier strongly supports the malicious nature of this PDF.

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=random+forest+feature+selection In PDF document text
    • http://files.virtualescapes2day.com/uploads/1/3/2/8/132814276/2745302.pdfIn PDF document text
    • http://files.westlakehsdance.com/uploads/1/3/2/7/132710694/tupategigaxasibujuw.pdfIn PDF document text
    • http://files.qwikpicz.com/uploads/1/3/0/8/130814858/jigaxafagowa.pdfIn PDF document text
    • http://files.ravenshuskyhavenandrescue.org/uploads/1/3/0/9/130969545/9adcafdd7c6.pdfIn PDF document text
    • http://files.nairegion2.org/uploads/1/3/0/8/130814280/cdafd.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/1/0440/0431/1190/files/bejali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/zakakebuzadupatipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/97098379232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/56126241344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/jozozarubazunajegadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/reactor_incremental_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/75549992865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/supabosisumirubamis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/banurewez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/9974357864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/18864038353.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 6

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_off0000706d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x706D 5056 bytes
SHA-256: 2676d27d5e6e150a4669fa850b531ab60beb7d2d839d615ce6591dc23e7772b1
font_01_sfnt_off00008184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 10672 bytes
SHA-256: 91d15b1668f7897ac797c1cc5f3f7a312285ddb9e64bca59fbb1849b4327592f
font_02_sfnt_off0000a5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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