Malicious PDF — malware analysis report

Static analysis result for SHA-256 c531437ddc9c116b…

MALICIOUS

PDF

100.1 KB Created: 2020-08-04 08:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b149005cc71edcfd8a13ff22bc3281fa SHA-1: 7d2bf6a657b594e0931ab2b36a6ac402945a14c7 SHA-256: c531437ddc9c116be1ba08c77f7559618fdd8c5493063fff665e57ebaad91c91
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Vargas Llosa biography PDF'. This suggests the primary goal is to trick the user into clicking the malicious link, likely leading to further malware download or exploitation.

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=vargas+llosa+biografia+pdf In PDF document text
    • http://files.milltownpictureframing.com/uploads/1/3/0/9/130969368/58e471057.pdfIn PDF document text
    • http://files.petmeisters.com/uploads/1/3/2/6/132682070/xixikud-fapinilikem.pdfIn PDF document text
    • http://files.ayurvedaora.com/uploads/1/3/1/1/131164431/fidexesurajad_jawalega_buzegulipeked.pdfIn PDF document text
    • http://files.nardamohammed.com/uploads/1/3/1/4/131408798/8673126.pdfIn PDF document text
    • http://files.apollotyresmanchester.co.uk/uploads/1/3/1/3/131380354/4667062.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/1/0432/5592/2852/files/6351535921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/namerowesukanex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/nedivowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/76918038421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/47315798922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/sades_902_drivers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/ouran_highschool_host_club_live_action.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/lidobas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/financial_accounting_10th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/statistical_mechanics_mcquarrie_download.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 7

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_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 5312 bytes
SHA-256: 4b9cce65b810aa11cf8413d26c3ea9854ee947da65780261ff59cd5c7998e1b0
font_01_sfnt_off00014c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C14 18360 bytes
SHA-256: f61c66882577261b08dde72480398b5cd52add9394a7c9cdc3d44ddae0189845

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