Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf11abc0b5c304f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 14:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c5355ff8ad0b7f6b9ae093bdb2b58786 SHA-1: 8eba666066c79d0b64f91e38c870e2e547651602 SHA-256: abf11abc0b5c304f2a7832b119b3ee121ca6af739471edf4ecc8a4d169005a7d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'network security books pdf free download' and the malicious redirector URL. This suggests the document is designed as a lure to drive users to malicious infrastructure, likely for further exploitation or malware delivery.

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/wb?keyword=network%20security%20books%20pdf%20free%20download In PDF document text
    • http://files.tricitysouth.ca/uploads/1/3/1/3/131380480/4c47cc1ba01.pdfIn PDF document text
    • http://files.muddyriver.org/uploads/1/3/1/4/131409244/zasogotagijosaz_daxivizozojole.pdfIn PDF document text
    • http://files.maydaystudio.com/uploads/1/3/0/8/130874211/xinalulebufilaril.pdfIn PDF document text
    • http://files.cheshirepool.net/uploads/1/3/0/7/130775974/wobofito_fizojujupipuje_lijodeli_goromodijoti.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/1/0433/0687/7080/files/ferenap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/dekiguleduk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4376/6950/files/9081156530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/viredomapeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/rufapibexuboxetira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/elements_of_photogrammetry_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/xetefapip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/83077715366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0930/8829/files/vilel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/vocabulary_for_academic_ielts_writing_task_1_part_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/18804275490.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 5516 bytes
SHA-256: a4342eb02002aa533d2b82f0a304a1aed1ebc4998c6ec08405753289bfab147d
font_01_sfnt_off000074e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 10016 bytes
SHA-256: 117e6aca90b8ea6d614d348238a17466e40f25fb130e29094570c2f4db3172a8

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