Malicious PDF — malware analysis report

Static analysis result for SHA-256 837f740fd15b388c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 01:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 063a6e879243f10ad2a695805a87cfd9 SHA-1: 9c4957b11221933183280b02e66aa517e08c1aaf SHA-256: 837f740fd15b388c25bb601e22ba641f4f97b8ee0c016c908cad4c736a1eded0
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, indicating an attempt to drive traffic to malicious infrastructure. The document body and heuristics suggest a lure for free downloads, likely leading to phishing or malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.cc/pify?keyword=cassadee+pope+the+voice+all+performances In PDF document text
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.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/1/0438/8831/2488/files/terminator_6_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/nokiwurudirerelolikugaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/65076768367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/domixakoxuwezufevugix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/bimimubesadosij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/41312795342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/zivuxidinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/zigokogitexexuxupulijex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000613c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 5360 bytes
SHA-256: f59b161c676ebda150440c6dd259002019d08de8c3dc2f3d6cc7c75db39dcb0f
font_01_sfnt_off00007353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7353 10556 bytes
SHA-256: 0a7ef09fbd8714688fa7dbfce3cbb7f30175cd6198700fce46c1538e705ed7b7

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