Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cffb40587cdb5bb…

MALICIOUS

PDF

46.7 KB Created: 2020-08-30 11:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e59ffc945127b3b28755d6945c2b09 SHA-1: 3d7617a3b46d1f9ac08aba95a14d0ec46032b93a SHA-256: 2cffb40587cdb5bbe710159fb42157f4fa2ee19591f160c6f7d6c5c840aa39a8
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'https://ttraff.link/wix?keyword=ratzel%2527+s+organic+theory'. Additionally, another critical heuristic identified it as a PDF link farm containing numerous external links, many pointing to 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking URLs, suggesting a lure to external 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=ratzel%2527+s+organic+theory
    • https://static.usrfiles.com/ugd/cfbfd2_ef1fd9514eae439089deac810bd19320.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7a68105eab4662814b48350b85eaa7.pdf
    • https://static.usrfiles.com/ugd/69695d_72adc083cd384c45847f2ac69e720511.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0f40f6d51cd4ed3a4cd5aecdc74f11a.pdf
    • https://static.usrfiles.com/ugd/225520_d3776d3181684732a05b160fe03614b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/238140_661f60d2efdd4c9fa4fd5d12a5424e0d.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7972/files/56972943156.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/concave_lens_image_formation_video.pdf
    • https://static.usrfiles.com/ugd/1e32c2_79cca8ade21f45ebb52e6295f95f3f62.pdf
    • https://static.usrfiles.com/ugd/2486b5_52fe21d30f41423594cbee69e6d35cd2.pdf
    • https://static.usrfiles.com/ugd/f4de5e_91aebac2c67d4e22b27afc25edbf2951.pdf
    • https://static.usrfiles.com/ugd/a44510_3828cfa0274a44dd8374b360983ba57f.pdf
    • https://static.usrfiles.com/ugd/fd7405_d6d533bae0a94174a4a91cc11328c657.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_off0000788a.bin
2d01ad6177ae4f62756e280b04622cae95d4da42776701dc4e4e12b1d0c54b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 5256 bytes
font_01_sfnt_off00008a7a.bin
9bdfeaee11706cf6419f1d6066f20fd08eccd5b36356eea73d4095692a58f12c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7A 10364 bytes