Malicious PDF — malware analysis report

Static analysis result for SHA-256 1580e1c216859295…

MALICIOUS

PDF

38.7 KB Created: 2020-09-05 13:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 985734b9b226d777d301964fc250db74 SHA-1: f45ac49531fd24c47d5f7424ce14812fdaf807a2 SHA-256: 1580e1c21685929582c95e6c7c5ddabcd6d7bfd3890660ab5f6a095dcb0e550c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, including a redirector URL, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The document body text is obfuscated and contains the primary malicious URL, which likely leads to further malicious content.

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.link/wix?keyword=choricha+mamla+mamahi+thambla+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b28ae2_caed2ae48c5945b9873edd3e48ad07cd.pdf
    • https://static.usrfiles.com/ugd/57c819_07e9b79f43634a4c94ab3fc27ed84d0c.pdf
    • https://static.usrfiles.com/ugd/7ff653_791a079e4ad24a7887a97fd20bddf4ce.pdf
    • https://static.usrfiles.com/ugd/87ad98_b26213222d6341628870fa50731a9f68.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_19642af04e2249cebc7536127e39a6fc.pdf
    • https://static.usrfiles.com/ugd/cc207a_8f30532a08544c7e973d8012bc4f2c93.pdf
    • https://static.usrfiles.com/ugd/e2f197_e56def95a823465fa30d613870746571.pdf
    • https://static.usrfiles.com/ugd/cb2bed_e1991772ab624ea7a6253d49c949c031.pdf
    • https://static.usrfiles.com/ugd/db1da1_49d9817ad6f2443baf562be4c2c23ea8.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/rejoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/zuromogidojudoxiso.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/62631303878.pdf
    • https://cdn.shopify.com/s/files/1/0459/9175/5938/files/fireworks_rocket_minecraft_guide.pdf
    • https://static.usrfiles.com/ugd/71fd01_0c730945c2ad4063b10346bc3ddb9637.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9996442cf4f24886946e74f2cdc9d.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_off00004f5f.bin
eadfe25205e0a3c4469f236eedd999fe9644754c3357848a011661eee8962f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5F 5260 bytes
font_01_sfnt_off00006109.bin
dfd598fce3be9ad7466d361ab596b2f060c6c2839784feb6cc2791ab25b22121
pdf-font-stream PDF embedded font (sfnt) at offset 0x6109 14540 bytes