Malicious PDF — malware analysis report

Static analysis result for SHA-256 5219bce8ee043ee0…

MALICIOUS

PDF

39.7 KB Created: 2020-09-04 08:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eebdb193d4897155b745ce5baee54302 SHA-1: a374115c7918a3867ea380d110179aa0df4d7913 SHA-256: 5219bce8ee043ee074078a3d029376144de6cef8be3d781a9891bc0f8baa7e06
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/wix?keyword=multiplying+polynomials+worksheet+answers+with+work', is the primary indicator of malicious intent. The document also exhibits characteristics of a PDF link farm, attempting to obscure the malicious redirector among numerous other links. The ML classifier strongly supports the malicious verdict.

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://ttraff.me/wix?keyword=multiplying+polynomials+worksheet+answers+with+work
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/notion_d_algorithme_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/pdf_cutter_and_joiner_software.pdf
    • https://cdn.shopify.com/s/files/1/0435/0119/1328/files/nogovunojiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/amiti_se_transforme_en_amour_citation.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_ddc49ddb408d4f25adc169f3d64b746b.pdf
    • https://static.usrfiles.com/ugd/c57cae_8bd5e9751d314b08944fca5bed215f38.pdf
    • https://static.usrfiles.com/ugd/a838c0_193f0be4273b450a92e681c75e41b664.pdf
    • https://static.usrfiles.com/ugd/466fa0_91bc378fb5bc4135b2a83999ab1c5259.pdf
    • https://static.usrfiles.com/ugd/bc0b97_d8d6ac4b33724eb386e0af23bab72e74.pdf
    • https://static.usrfiles.com/ugd/58a813_c42d9b1c40f3421285bf21e798f844d4.pdf
    • https://static.usrfiles.com/ugd/834936_a14e86a26db74b8ca88890d4e312fa00.pdf
    • https://static.usrfiles.com/ugd/e8506d_a0cbdb1fd95046b5a7e912b447ace5d9.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c21.bin
c5610200eda9926698ccd46c5462f17b28f5c8db9921ce1e74d6500bfb00b515
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C21 5496 bytes
font_01_sfnt_off00006ec8.bin
630a43de348e28c0cd24aea0eb92c9c77b351bee929b660ac98500fe1bdcf840
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 10304 bytes