Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636072a4f884958…

MALICIOUS

PDF

35.0 KB Created: 2020-08-03 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: db9589967a5b9b343b29e353556149e4 SHA-1: 26323410dfc5cc7af1252b49cf6c7fda37acf912 SHA-256: 8636072a4f884958043a215500006112f1d5c161c3f638fc90820c2990a70cb5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or phishing lure. The primary redirector URL is associated with malicious activity. The document body, though heavily obfuscated, contains the same redirector URL and benign-looking PDF filenames, suggesting a social engineering attempt to trick users into downloading further malicious content. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=advanced%20computer%20architecture%20parallelism%20scalability%20programmability%20kai%20hwang%20pdf In PDF document text
    • http://files.neighbors4christ.org/uploads/1/3/2/7/132712096/xevegigumo.pdfIn PDF document text
    • http://files.naacpaustin.com/uploads/1/3/1/3/131379894/4441134.pdfIn PDF document text
    • http://files.electroyelizondo.com/uploads/1/3/1/4/131438523/1482951.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/1/0431/6354/9845/files/gibijijidiketobisix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/netfl_c4_b0x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/wowagixupugawegij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/neir_automata_mods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/golapijukojon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/42536593771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/refx_nexus_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/internship_survival_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/63197057161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/mamexawobapigevopad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/wemek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/71196802453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/unlz_gba_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/dezuriwevirudetijogisi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4950 6016 bytes
SHA-256: 2336874272609b059c091efc277fef601c114499a5edfd00555974bba19d1a65
font_01_sfnt_off00005db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 9516 bytes
SHA-256: 05f0b31b341eb3c64ceb514b960897ff93573b0de0a0a5a0ced4702e8229b051