Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f9e1c6472fc0d…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 21:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6364e7328239d0b2eece707a33afee SHA-1: be99ba097dc6c351a1760f4af9a3e1ca80c8529d SHA-256: 577f9e1c6472fc0d8bd6cb26fa7cefea0bffa3dbe95ff93586710945229cac82
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a SEO link farm. The document body, though heavily obfuscated, contains the same malicious URL. The primary attack pattern involves luring the user to this URL under the guise of downloading MP3 files.

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/wix?keyword=willy+william+ego+mp3+song+download+320kbps
    • https://static.usrfiles.com/ugd/b8c837_4a12b8c2a6b14c78b162a8183953af0f.pdf
    • https://static.usrfiles.com/ugd/2ca09c_e13c1bcb21ee46f28d1dc17ad8fa9e66.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1106e07fa74690aa14897735df7630.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8954/files/79589639.pdf
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/metativiwesolomotewur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/alchymista_ke_staen_zdarma.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/cm_bey_zodiac_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9902/files/42519640476.pdf
    • https://static.usrfiles.com/ugd/b8c837_06c2953bfe0242299008cf429c93311e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9edcdeee7704fec85d35c9496dce486.pdf
    • https://static.usrfiles.com/ugd/b8c837_d16b9d2c77d5454a941cd3e21d0d2f7c.pdf
    • https://static.usrfiles.com/ugd/9219f8_2f3b49624ade4cd0939f841ef0632ac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_391fd59f4b0c47a599bb0c94c1874c0b.pdf
    • https://static.usrfiles.com/ugd/b65acf_48946ee3fda34797a21246dcd81536ef.pdf
    • https://static.usrfiles.com/ugd/9219f8_905d48146cec4b158a770f322227ffe1.pdf
    • https://static.usrfiles.com/ugd/4826f5_5b4b0af00526473ca674d9eb6827c344.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_b3941e7cc129442a8f5fe2ea423ffa0a.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_off00004f84.bin
74a3f14adba8a9453d39477bdd263c82874dc10aafb21041254612b2854708d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F84 6032 bytes
font_01_sfnt_off00006413.bin
5e24077156ab27e0f316523f7a0c7ab5fe1d84291c8345d5e3023a64df314c68
pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 10452 bytes