Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3481cd37d6f2cf…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 23:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4d102090039110b4e67822d6f0e50b SHA-1: e5105c2075dd1af459fb924008d8fe826351dfb7 SHA-256: eb3481cd37d6f2cf310b9f085bcaaccfff615ff18e771d29e10810cb97dc67a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=tipos+de+diagnostico+en+trabajo+social'. This URL is likely used to redirect users to a malicious site. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to external PDF files. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.cc/wix?keyword=tipos+de+diagnostico+en+trabajo+social
    • https://static.usrfiles.com/ugd/544c7e_59d4f9e5faa64dcf84beb9beb30aa658.pdf
    • https://static.usrfiles.com/ugd/b8c837_d38ddbb468934632b2c0b4658c6776b2.pdf
    • https://static.usrfiles.com/ugd/b98abb_9873e29b049c4f58be674bb401fd769f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/ponip.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/sorizesakimazuwujowimawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/assassins_creed_origins_guia.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/nugajenagukenusuloni.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7017/files/fubesesemogozaberibimog.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd13bc5671c41d9bfb1df8e0549c6cc.pdf
    • https://static.usrfiles.com/ugd/a771bd_362fe81ecc554b709af20155602a34d5.pdf
    • https://static.usrfiles.com/ugd/daca0d_01b8ee9855a8446aa737a973bcf1e136.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ebc.bin
fd41f3e199183f9807363294dfc119511b14138571f608a334c458b943d7b1bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBC 5196 bytes
font_01_sfnt_off0000706a.bin
32b63ee0250f9f88efd97924533702b429ef3f5e6a6601196aafe8efe1bc5e95
pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 10984 bytes
font_02_sfnt_off0000941a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 4324 bytes