Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f77ee451d7e75ac…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 16:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990760c72dd0b3c903ce2b40900e9907 SHA-1: 5d41b0712bc1565e44015f528f6e6dd5306d1468 SHA-256: 5f77ee451d7e75ac85019873bb2349ed022b650b2049abbec05d22c5d2b8ab31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm and a direct link to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same redirector URL. The primary goal seems to be directing users to malicious infrastructure, likely for further exploitation or phishing.

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.com/pify?keyword=my+dare+report+5th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/6f9b04_5c25afeae1824dd1b9800642d5b8ff37.pdf
    • https://static.usrfiles.com/ugd/b8c837_7916537059cc45f88ceacf1d70a4e61d.pdf
    • https://static.usrfiles.com/ugd/865d50_ccf6949176d6461c85023ddd4b9a9920.pdf
    • https://static.usrfiles.com/ugd/ee6770_2a86022701e14e3c87ba758fc847d018.pdf
    • https://static.usrfiles.com/ugd/b8c837_12f9d3d6161947c6aca4565ed9c2ee0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6b4234fe5b40cf8267ac9d5b319ead.pdf
    • https://static.usrfiles.com/ugd/0adedf_840116b37fe244be93fb65b570dd0450.pdf
    • https://static.usrfiles.com/ugd/f3cb45_39cd45441da34409884ef966c716c542.pdf
    • https://static.usrfiles.com/ugd/857e61_902a9a85e57d447e90dda7a7d08e6b82.pdf
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/6778026500.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7539/files/gefojujamovitebivo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7221/files/2_digit_subtraction_with_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/ossiarch_bonereapers_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8a.bin
edbfbc971cf44e536754863a009885bae155ca47f6388a7489427a75669c9279
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 5244 bytes
font_01_sfnt_off00007170.bin
36b684dd3344179788700c9f8061f01a47fb3f51c1eb033f7bb990ac158b2419
pdf-font-stream PDF embedded font (sfnt) at offset 0x7170 9804 bytes