Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9858194d0d6b7fa…

MALICIOUS

PDF

43.4 KB Created: 2020-08-18 23:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5c9a65d233fd4d8fd8c413f4d58b88a6 SHA-1: 300774afa43a1f46c899c572a473aa81a8df153c SHA-256: f9858194d0d6b7faa021c8ccbd4cb8e7acf893b6d5fdd0f1c000adb367de58f1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' lure, and the embedded links are designed to lead users to potentially malicious content. The ML classifier strongly indicates maliciousness.

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=6th+grade+math+module+3+answer+key In PDF document text
    • http://files.richardhstephens.com/uploads/1/3/1/0/131071157/731797bd05.pdfIn PDF document text
    • http://files.magnetvideolab.com/uploads/1/3/1/4/131408432/kerafirujesutav.pdfIn PDF document text
    • http://files.jvandoorne.com/uploads/1/3/2/7/132740541/kaviwarawo.pdfIn PDF document text
    • http://vugatute.graces-ark.com/uploads/1/3/1/8/131856271/naxigagesejobe_xonixokuveleb_tubex_bizerozeroji.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/1/0430/7589/5447/files/viginozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/gajekoxurujebasemevix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9602/0894/files/kipexuvifinurip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/beginner_english_reading.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8270/9160/files/certified_cicerone_sample_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/presentation_in_english_macmillan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/dreams_fleetwood_mac_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/chinese_restaurant_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/75435714641.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00004dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCB 5720 bytes
SHA-256: 79915d0bc0300a6b5253a0b12c2312a3948fbb2cba3246952c32fda12393138e
font_01_sfnt_off0000612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 12912 bytes
SHA-256: a5dffc7de49c91083c16bed3ad2853addc15474089c628e983ab781fa623e8c7
font_02_sfnt_off00008a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A05 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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