Malicious PDF — malware analysis report

Static analysis result for SHA-256 a517a327530b2bce…

MALICIOUS

PDF

47.3 KB Created: 2020-08-29 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c5d8ddf11688e46c4ccbb863de242be SHA-1: a6888e6d3403eb828926c59899f3dbf71cffe900 SHA-256: a517a327530b2bce4d77583f3b89ed1ab3a186874912a711c7bed7a502f0c573
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Bluestacks free for windows 8.1 laptop' and the malicious URL, suggesting a lure for users seeking software. The PDF also contains a large number of external links, as flagged by PDF_SEO_LINK_FARM, indicating a link farm used for SEO poisoning or redirection.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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/wix?keyword=bluestacks+free++for+windows+8.+1+laptop In 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/1/0429/0415/8375/files/pibajidowovokikonudupepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/best_reader_linux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/dataflow_report_transfer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/problemas_numeros_enteros_6_primaria.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_309a309bfe6143808f7624433e6b85f0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_791fd0c048c3440aaea525b831fe53db.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0aab01_48fa974949c3436b8a91be087ce2f8c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0ebc1f_b44d64a52e0641fc8bfc8b3b471feb2b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_34572aa648de458f823d9caeefdf3df6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_654318febe3c4c898b880f985123ceab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_dcbced4a0dc24b97ac1b3bec8faca0d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b9dd1f4941204249bc8796e2d77bc6a5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4dc69e9bc9cb43d69996ab5e752d6785.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/286fb8_b61f39b3995a491c81af026081c05ad9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0fdb6d_c42a700839fa415894cda1078ba4862c.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 2

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_off00006510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6510 5632 bytes
SHA-256: b564253ad0479403247cb60eb73d36978972b33919ab45da96b55f8cdb4fe6db
font_01_sfnt_off00007864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 10192 bytes
SHA-256: 889ba52cc095bcd3c7ea30d6fe294b5caffa092a97db00c93c19a589e5116437
font_02_sfnt_off00009b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6F 16080 bytes
SHA-256: d36da4fd2ab8c4dd3ac6c046b788d156341ebfd1121c5e6b8b5107a79d777502

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