Malicious PDF — malware analysis report

Static analysis result for SHA-256 a480db2243551b7e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 20:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a9f77e09361dfae5afc5906bdc3f11ef SHA-1: 9487d660b411912b5c8016fbe2282447ad74ac41 SHA-256: a480db2243551b7e23f5bd80f6b8341f3115e4ced76e1394827dc24a26131f0d
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'weekly budget planner template excel' and the malicious URL. The presence of numerous external PDF links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination and potentially improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=weekly+budget+planner+template+excel In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/09273f_96c1583926f0415f9d369ff097508f8c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_82bde895ce6f40999d80045b31ea7c76.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f55bec_151d07c3a70c4916a719db636782d4f1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/909b15_e712a238b9be463aae94858af62be1cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3ecbe_457bb54e4ece4ede9d64b9ca9f1c28cd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ecadc_051ecd019ea340158d4ef7bebc267c59.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/teoria_del_centesimo_mono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4869/7757/files/duwujagomubivopimakazalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/92511547410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/41957952324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/tadano_atf_220g_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/65603755154.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 4

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_off00006a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A12 5604 bytes
SHA-256: 311efbd77342125741a3dca744eb284404281ee1ade5561a736755dbaf055ee9
font_01_sfnt_off00007d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D30 9980 bytes
SHA-256: 370a63458a651ebaa8ec61f9e42812ef67208b48545b42bb82a30ea2922dd78c

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