Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e57fa0d99d065b…

MALICIOUS

PDF

127.2 KB Created: 2020-08-19 10:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6fd4ffb540b2c17c6b73928a3e1cfb9f SHA-1: b14b160d68b81aa47d231f94d06a310ab605bf2e SHA-256: 99e57fa0d99d065b307ecb34d83af5781735e4dd326d5ff3fed957137e9515e3
234 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link T1566.002 Spearphishing Attachment T1059.003 Windows Command Shell

The PDF contains multiple heuristics indicating malicious intent, including a link to a known malicious redirector and a large number of external PDF links, suggesting a link farm. The document body also contains language typical of advance-fee scams and instructs the user to interact with command-line interfaces, likely to download or execute further payloads. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.ru/pify?keyword=lotus+1-+2-+3+spreadsheet+file In PDF document text
    • http://rovekax.kienmassage.com/uploads/1/3/1/3/131381533/favugumivog-pexufaziri-lumiwakep-ravaxolusu.pdfIn PDF document text
    • http://files.texasdispro.com/uploads/1/3/0/8/130874526/17c27b0b5.pdfIn PDF document text
    • http://files.liacorrales.com/uploads/1/3/1/4/131406505/zejetod_poriroradix_novejonufe_renan.pdfIn PDF document text
    • http://ruvifojo.lpprom.org/uploads/1/3/1/6/131606490/jawopujizid.pdfIn PDF document text
    • http://romefet.sandydex.com/uploads/1/3/0/8/130814328/74d8196420.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/1/0434/4669/8146/files/16981198944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/41239983577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/vijudufezotejazeze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/febisosurewoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/53478931658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/lezibumadokegebumipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/25541868600.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/rukalenalorogakoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/management_information_systems_moving_business_forward_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/calligraphy_practice_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/analysis_of_sorting_algorithms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7556/6752/files/ct_bill_of_sale.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_off0001707f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707F 17732 bytes
SHA-256: adfd42a941daa48e4dffd1b42063de24be1cd1787071886ef73508caf393369c
font_01_sfnt_off0001a9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9AB 5452 bytes
SHA-256: d51bd1b577e2794359c9b0a4c5be53cc02b2d6321b678bd141af7502789e0fb9
font_02_sfnt_off0001bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC38 16044 bytes
SHA-256: 8b1bdc5a4e9d71c03cbef7f1d458c735c10ffe7ec2a221644a96ce77de69cb14