Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0f132adca58c66…

MALICIOUS

PDF

39.3 KB Created: 2020-08-14 19:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e50eb8f61d4222d1ac3ae7bf8ebb3f61 SHA-1: 35eece9ced5ab5783f8ea2f9aecddbc69027aed8 SHA-256: 6a0f132adca58c66497b12206bdc55d0a881d49ca501ea6640741b6169ec2a69
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains multiple heuristics indicating malicious intent, specifically linking to a known malicious redirector and a large number of external PDF links. The document body contains obfuscated text and embedded URLs, including the malicious redirector https://ttraff.ru/wb?keyword=recuento%20de%20reticulocitos%20fundamento%20pdf, which is likely used to obscure the true destination or for SEO manipulation. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or SEO spam campaign.

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/wb?keyword=recuento%20de%20reticulocitos%20fundamento%20pdf In PDF document text
    • http://files.bucklesandbeads.com/uploads/1/3/2/6/132682338/marefetovabuvi-bufetexetetako.pdfIn PDF document text
    • http://files.kristinedizon.com/uploads/1/3/2/6/132681436/4063297.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/1/0431/0417/4233/files/cambridge_igcse_computer_science_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/69893816866.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0484/6503/files/91704496331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/50820247245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/sikuxejatave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/wirilopukabukajegob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/dodiwireni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/convertidor_catalitico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7245/2776/files/xixazudomidaxiramewik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/construction_project_administrator_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6774/3139/files/great_britain_history.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D9 5308 bytes
SHA-256: 3d6d6fcb2a6175dbd625cfe1c7bb614cf6867dc1d842f64d46b3fc89fd936b67
font_01_sfnt_off00006acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACD 11040 bytes
SHA-256: b11a674fea81de825f3c97ca24ad4474a82324e36bcc5ba1f3fce54e433ea910

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