Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99728d3d98c8b53…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 01:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a0b97495b08b67499affe762af92b35d SHA-1: 00de78bc3cf7dd2f91e37d1ae34d2d08dc04282c SHA-256: c99728d3d98c8b53d23369fee57fab7948b90c9fcf6c322c2e236b3505ad7c8d
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Allahabad state university llb exam date sheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further supports the SEO link farm heuristic.

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/pify?keyword=allahabad+state+university+llb+exam+date+sheet In PDF document text
    • http://files.jeujeulafoille.com/uploads/1/3/1/4/131453595/7e0ed67c8c.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/1/0431/4926/2997/files/5609670357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/78882760242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5742/9145/files/data_analysis_with_r_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/roxanuwesuleg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/50715933094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/18750020260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/centigrade_to_fahrenheit_conversion_chart.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F68 5424 bytes
SHA-256: ff96a0a8ae31b2cfaff23a9e700b836c0fc7ff0dd5c8f1dcc5eb39ab289c4342
font_01_sfnt_off000071a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00007d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 14784 bytes
SHA-256: 8cd0b1ac24b7f5b3d0bdce310cd043aee126ecb624fecb77243c6f0113dba91a
font_03_sfnt_off0000aa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA93 7492 bytes
SHA-256: 87522dd4bb2fe6d3d0f4a0e9ecf2a59e7a43aa36d8c5b57f99349f9bd712649c

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