Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b996c2f81c7ee7e…

MALICIOUS

PDF

48.6 KB Created: 2020-08-18 20:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c78b66c04087bc1f03bc5e1e692b73cc SHA-1: e20d15a0fe6dd48f780c9cebbbd3eea7c043f57c SHA-256: 1b996c2f81c7ee7e18478852851c0cf141c839a430d3e6752d9bd1f8378f49ab
202 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create a link farm, with a primary malicious redirector URL identified. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a phishing or malware distribution site. The ML classifier strongly indicates maliciousness, and the presence of redirector links points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=pediatric+febrile+neutropenia+guidelines+2017 In PDF document text
    • http://files.reaganinmyownworld.com/uploads/1/3/0/7/130738614/f277a2dd.pdfIn PDF document text
    • http://nabopaler.personcoeducationfoundation.org/uploads/1/3/1/3/131379678/gurunogokos.pdfIn PDF document text
    • http://japanak.peacecorpsunion.com/uploads/1/3/1/8/131871390/saxerulovajasulunez.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/1/0438/4302/7106/files/4098762061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0358/8258/files/84311017962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/22719275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1908/2655/files/13364729546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/22980256226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/anemia_kekurangan_zat_besi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8667/6135/files/hallelujah_choir_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/47072491381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/82375886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/barricades_mystrieuses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/7146395340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/adobe_illustrator_cs2_tutorials_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/30432454531.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_off00007c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2F 5872 bytes
SHA-256: d24026c4a666a8b5e06e4ac71ee46e250a67b539f73b637ac42e8580a7f00910
font_01_sfnt_off0000903f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903F 10816 bytes
SHA-256: 52cc1e9d0a6d2bd2ec128d27fbb647987e8ae1e64b23ea78bf27d876d54c87f2