Malicious PDF — malware analysis report

Static analysis result for SHA-256 d755c83927ea25a6…

MALICIOUS

PDF

66.8 KB Created: 2020-09-30 21:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87b46cee9fcafe95133fa40a669b25c5 SHA-1: 1a24a62dea3aa4f6eebf9beff9e789796f9271d1 SHA-256: d755c83927ea25a65399015d8ab24b5c2f1eedc473dc3c45cb79d41f8e3d8c73
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to domains associated with link farming and redirecting to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a harmful site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=hernan+abelardo+castillo+pdf In PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/1216061752.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/87262668552.pdfIn PDF document text
    • https://site-1039602.mozfiles.com/files/1039602/66554107032.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/pepiviwesapumulebapu.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/14881394053.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/1/0428/9835/8432/files/98223768302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2904/3099/files/my_time_at_portia_horse_stats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/let_pass_time_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/archaeology_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5247/3243/files/dr_mario_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/diganik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/fazolawufavibatuzonawuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/wetifekonutulokidoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/99716424602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/5272/9247/files/sifovigilelazelevutosed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/antonio_pasquali_comprender_la_comunicacin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/vanelekufesapesotowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8877/1227/files/how_to_alphabetise_in_excel_spreadsheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/25869738812.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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 5248 bytes
SHA-256: a04130005b0d68f6a01814db57f0f3b466f7dc933cccb15a75be469d9b84f448
font_01_sfnt_off0000c06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06B 11452 bytes
SHA-256: a7682ea0a48ec8c1fe072c31d2e70f028b21aea91333ddae0a778dd6b90617e9
font_02_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16508 bytes
SHA-256: 1ab116e283dde8aac2d56687afe3fdca9f24aa63afa541b632b959b1ade62732

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