Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99efff13ae17e5d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-06 17:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8d1f20bdd6136d39418abd34f03c9efa SHA-1: a50f902739862bdeb9afba5e526c341ab47c69a7 SHA-256: a99efff13ae17e5d21a0c2c1edc395ffc65314cbb34a33586daa420b33fff853
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to academic syllabi and includes the URL 'https://ttraff.com/pify?keyword=ias+baba+upsc+syllabus+pdf', which is flagged as a malicious redirector. This suggests the document is designed to trick users into clicking the link under the guise of educational material, leading them to a malicious site.

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.com/pify?keyword=ias+baba+upsc+syllabus+pdf In PDF document text
    • http://files.kathybertone.com/uploads/1/3/0/7/130775465/12934fa.pdfIn PDF document text
    • http://files.colesworldofmathematics.com/uploads/1/3/0/7/130740391/zipadadedofo.pdfIn PDF document text
    • http://files.rockport-pewter.com/uploads/1/3/1/0/131069875/f1f0a74afa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/aptitude_test_questions_for_engineering_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/zefujugeruwaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/nukotenuvaxupakopum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/matlab_nearest_neighbor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/jonijijapubizagolosikonab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/focusrite_usb_1._1_audio_control_panel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/sivudatuvobiganu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/28013786377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/can_you_mass_unfollow_on_instagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/az_101_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3303/2864/files/unzip_gz_file_linux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5041/6793/files/stanly_county_sheriff_arrests.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
🗂 Part of campaign: colesworldofmathematics.com 3 samples

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 4652 bytes
SHA-256: 27f66dfda23c83f67577ea42af6034de0dada22a7a11e9e2ad713855354f8e88
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10524 bytes
SHA-256: e43c22c34fbe3419034d8f80650fe72003b3027350a1c28d2bf88c06fb878938
font_02_sfnt_off00009634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9634 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176