Malicious PDF — malware analysis report

Static analysis result for SHA-256 d991af69fd10c02f…

MALICIOUS

PDF

62.2 KB Created: 2020-08-18 22:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 82693b6c61aba72eeb40749ab7e11921 SHA-1: 737f442d592e1ca84574cd9c9aabe0a5d5274d06 SHA-256: d991af69fd10c02fd33b131d4f3866437fd1fbd773cfe62f1051ff0116be96aa
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The document body and embedded links also point to a URL that appears to be part of a link farm, specifically targeting 'ad blocker pc free'. This suggests a social engineering attempt to redirect users 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=ad+blocker+pc+free In PDF document text
    • http://surad.berkleysteelers.net/uploads/1/3/2/6/132695471/pesamogugudowo_vezidasaduzi.pdfIn PDF document text
    • http://rolug.graciayverdadmemphis.com/uploads/1/3/1/3/131398455/855c4bc10.pdfIn PDF document text
    • http://files.mattkurdt.com/uploads/1/3/1/4/131407877/kesazukafole.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/1/0432/7204/4697/files/sizamagilulezamufux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/carte_du_monde.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/cissp_book_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/10873800611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7864/7957/files/deconstructivism_architecture.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/16736175209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/ionic_compounds_unit_6_worksheet_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/lagu_balungan_kere_koplo_uyeshare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0742/2109/files/listview_using_baseadapter_in_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8525/0216/files/ketuwalutizetuvadadexis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/nowasobeneriwuvag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/goxasesarabekexoperef.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3A 4956 bytes
SHA-256: 8501d59a5c51150a803dcab4ea30cd23f28b7bfc84f7f9d02f843d48c70287b5
font_01_sfnt_off0000ac22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC22 10900 bytes
SHA-256: 79c77571585b5d01458127624ff4eae771204f868f1bcf05ab8a7bc7286d19af
font_02_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 17444 bytes
SHA-256: f15c4a3a02a21542e78f8dc62721252e591d300a37b6a71781dea56b96efe480