Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a715db048f647…

MALICIOUS

PDF

67.9 KB Created: 2020-11-01 23:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a316b8191da231c4852944ac1958ec SHA-1: 144cab576db7dc46b0bf543bc02a418254d8af99 SHA-256: bf5a715db048f6478bda57564cfd1e348b12717f40abfa555a4eec76136affca
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged as malicious by multiple heuristics, including a redirector link and an advance-fee scam lure. The document body contains a URL that appears to be part of the lure, directing users to a potentially malicious site. The presence of numerous external links, many pointing to benign PDFs, suggests a link farm used to obscure the malicious redirector.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.link/123?keyword=pandan+antique+philippines+map
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f957d6bf2a84.pdf
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f89e6c786621.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0497/2340/8545/files/calendario_2020_colombia_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/cross_platform_card_games_android.pdf
    • https://uploads.strikinglycdn.com/files/f61406a9-73e1-4553-9f85-3a71b3d7f56a/20055731550.pdf
    • https://s3.amazonaws.com/fasanag/92007127954.pdf
    • https://s3.amazonaws.com/wilugugo/lexisegunelokoworubokot.pdf
    • https://cdn.shopify.com/s/files/1/0500/2176/1194/files/89660475869.pdf
    • https://s3.amazonaws.com/pukasojalu/dna_history_webquest_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/945e5b73-e65a-49fc-b1cc-5649011646f3/return_man_2_flash_espn_games.pdf
    • https://cdn.shopify.com/s/files/1/0493/0332/2783/files/sea_ray_amberjack_290_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6820/files/76872788070.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8d5.bin
69e2cf05236a69c75ca773834abedf9a0b972c72f3703474ff2334534a6b2521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D5 5232 bytes
font_01_sfnt_off0000ba79.bin
0d67cf83c69f5dbe3e6ea15a67630135fb3d3db0729b329e1a5e045fa64d7847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 16428 bytes
font_02_sfnt_off0000edfb.bin
ec005456da4dfccc8c277e0cba3e62458e07eb19f1aa3b3677bd4b27181e3eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16092 bytes

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