Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e7256a26f504d8…

MALICIOUS

PDF

45.9 KB Created: 2020-09-09 18:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 01acd5148742a12098882ff03a0c645c SHA-1: 8544ca8cb731a198c1b3d2d73de187ac46c168ca SHA-256: b4e7256a26f504d8f93772b58d4e5f05bbc11c1fd419d3e3066eb0c354d9eba3
202 Risk Score

Malware Insights

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

The PDF contains a lure for a 'free download' and embeds numerous links to external PDFs, many of which point to SEO-optimized link farms. One critical heuristic indicates a direct link to a known malicious redirector at ttraff.com. The document body itself is heavily obfuscated but contains the initial lure URL. No scripts were extracted from this sample.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=arihant%20general%20knowledge%20book%20pdf%20free%20download In PDF document text
    • http://nulig.krgabogados.com/uploads/1/3/1/6/131637308/ruwibiw.pdfIn PDF document text
    • http://files.interactive-maths.com/uploads/1/3/1/3/131397964/nojanulujowumujesi.pdfIn PDF document text
    • http://files.metalworxroofing.com/uploads/1/3/0/7/130739239/3234161.pdfIn PDF document text
    • http://files.livinglifewithcancer.com/uploads/1/3/0/8/130874655/6469520.pdfIn PDF document text
    • http://tekusa.ndnarts.com/uploads/1/3/2/7/132740480/6745591.pdfIn PDF document text
    • http://files.nflpicks16.com/uploads/1/3/0/7/130739431/jabufufe.pdfIn PDF document text
    • http://wovasano.aphotobydre.com/uploads/1/3/2/6/132683014/nobevidi.pdfIn PDF document text
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/20032167130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/salamanders_codex_supplement_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/postpartum_hemorrhage_pathophysiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8030/9141/files/basketball_score_sheet_excel_fiba.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 8

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_off0000623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 5408 bytes
SHA-256: ce72a0ddf1303d76ae8602da14f1dbe00b0457102805b53033858a650f056bf5
font_01_sfnt_off000074ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 10352 bytes
SHA-256: 02e522f6f9354600fe2a71006ec08a3aeb443c9a226fc51e13b3e634456952c0
font_02_sfnt_off00009843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9843 5016 bytes
SHA-256: 3cc1942d6ccc8a101982395fae3746f9be036b0744e80fbcc47eb0790b1f863f

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