Malicious PDF — malware analysis report

Static analysis result for SHA-256 f161aaa3dbfb0be6…

MALICIOUS

PDF

43.6 KB Created: 2020-08-20 07:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 90fce51d9f1858859d4960d0a901d692 SHA-1: 36cdfeb1a9665b8014d1cc4d0aa678b1840dc57b SHA-256: f161aaa3dbfb0be6f26598c3b41646d4102300539651fecd60bd66eef55a5fd2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary lure appears to be related to "bronchitis antibiotic guidelines", directing users to the `ttraff.ru` domain. While no scripts were extracted, the presence of numerous embedded links, many hosted on `cdn.shopify.com`, suggests a content-driven lure to a malicious site.

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=bronchitis+antibiotic+guidelines In PDF document text
    • http://files.csstemcert.com/uploads/1/3/2/3/132303045/kufub.pdfIn PDF document text
    • http://vukigak.martynsmondayclub.co.uk/uploads/1/3/0/8/130814238/vafiri.pdfIn PDF document text
    • http://files.lefkasluxuryvillas.com/uploads/1/3/1/4/131407572/a698b2ba0245db8.pdfIn PDF document text
    • http://files.gratefulhomestead.net/uploads/1/3/2/6/132682848/588403.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/1/0428/9835/8432/files/2857609843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/78467696530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/56165162872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0158/5569/files/95232882808.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/demiwalorat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/53781814496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7039/8362/files/oxidation_reduction_titration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5479/1846/files/76173310439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/xuzador.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/23481564207.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 5272 bytes
SHA-256: b7973678e94503eafcbbd6c9bd70abe20a7b831221961a19ff458f7460776b99
font_01_sfnt_off00007191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7191 10020 bytes
SHA-256: 3694a9f5db3143cc0bfdbdcbf11cf7a3d01e8b80709276c486f4f218a6381543
font_02_sfnt_off000093ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93AD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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