Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ed751a74027c0f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 583ebc347521953d0bfdbf7141f35f44 SHA-1: 0f54d054dee9f83e0dff047f51a177dff2cfbb97 SHA-256: 16ed751a74027c0f050b71d6f4a7bac4c5f3ad24063fd136347fd6a19fc1ce0c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service designed to host SEO-optimized lures for phishing. The primary redirector URL, 'https://ttraff.com/wb?keyword=geografija%20za%206%20razred%20pdf', suggests a lure related to educational materials. The ML classifier strongly indicates maliciousness, and the presence of a link farm points towards an attempt to distribute malicious content.

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/wb?keyword=geografija%20za%206%20razred%20pdf In PDF document text
    • http://rudezij.gainesvilleinsurancecoverage.com/uploads/1/3/1/3/131383483/gutozijarowe-xukaviralej.pdfIn PDF document text
    • http://guxum.carlya2z.com/uploads/1/3/0/8/130874592/7d7c74c65d089.pdfIn PDF document text
    • http://files.secondbaptistwalworth.org/uploads/1/3/2/8/132815298/c58c53868b.pdfIn PDF document text
    • http://jevow.j2theson.com/uploads/1/3/2/6/132695578/vovada.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/1/0440/7299/2918/files/debuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2707/8042/files/zavowigokifinesojukazuser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/71777539410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/wuxewafalejerefanotupix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/lineguz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/xotinus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/minnesota_driver_s_license_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/gutawetavedekadafek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/59482303063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9933/2512/files/samovojesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/98890748331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/fusupe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF4 4912 bytes
SHA-256: f173851b56047c357a59d5db83c225c0461256ea3b64798dad35b801309f7d28
font_01_sfnt_off00006cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC6 11192 bytes
SHA-256: 824c4edf0925d62f080d62a25e0fc6c210e8fe315780734014a596c6a22c8f4e
font_02_sfnt_off0000912f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3