Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd861a881618184f…

MALICIOUS

PDF

46.9 KB Created: 2020-08-18 16:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c641cb2567652e16383ea66d3fac77f SHA-1: 753e67971987b5a222df2761bba059e489fb8e1b SHA-256: cd861a881618184f76e2b78c58804a5486d1e07378411737e654cd34c3a27e95
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to shopify.com, but one critical link to ttraff.ru is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=angle+sum+of+a+polygon+worksheet In PDF document text
    • http://files.gistrummers.com/uploads/1/3/1/4/131454373/vavago.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/1/0427/8072/1311/files/sogomebap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/polor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3060/9063/files/letter_of_interest_sample_for_employment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/kazoxizemumoforegalulux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/adjetivos_posesivos_ejercicios_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/89356428420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/gafabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/35457812721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/jevabumuseduwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/52387641586.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00005b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 5564 bytes
SHA-256: 060312f9bc77ecd35dfb0c89c863d0e08a06089b547f1cc48cfa33e4ccb21ae7
font_01_sfnt_off00006e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E77 13272 bytes
SHA-256: 2389813b1b7336c41eda344cb2688e2f95255426586dd88d3d22631f9fc5e72a
font_02_sfnt_off000098ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AB 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357

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